Home
Class 12
PHYSICS
A child is standing at one end of a long...

A child is standing at one end of a long trolley moving with a speed v on a smooth horizontal floor. If the child starts running towards the other end of the trolley with a speed u, the centre of mass of the system (trolley + child) will move with a speed

A

Zero

B

`(v+u)`

C

`v`

D

`(v-u)`

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • SYSTEM OF PARTICLES AND ROTATIONAL MOTION

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section - B) Objective Type Questions (One option is correct)|60 Videos

  • SYSTEM OF PARTICLES AND ROTATIONAL MOTION

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section - C) Objective Type Questions (More than one option are correct)|29 Videos

  • SYSTEM OF PARTICLES AND ROTATIONAL MOTION

    AAKASH INSTITUTE ENGLISH|Exercise Illustration|4 Videos

  • SEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section-D (Assertion and reason))|5 Videos

  • TEST 1

    AAKASH INSTITUTE ENGLISH|Exercise EXERCISE|21 Videos

Similar Questions

Explore conceptually related problems

A child is standing at one end of a long trolley moving with a speed v on a smooth horizontal track. If the child starts running towards the other end of the trolley with a speed u, the centre of mass of the system (trolley + child) will move with a speed :

A child is standing at one end of a long trolley moving with a speed v on a smooth horizontal track. If the child starts running towards the other end of the trolley with a speed u, the centre of mass of the system (trolley + child) will move with a speed :

A man of mass m is standing at one end of a trolley of mass Mand length L placed at rest on a smooth horizontal surface. The man starts moving towards the other end and covers distance L, then distance moved by man w.r.t ground is

A trolley filled with sand is moving with a velocity v on a smooth horizontal surface due to inertia. If the sand falls off at the rate of mu kg//sec , the velocity of the trolley as a function of time will be best represented by:

A man of mass m is standing on a plank of equal mass m resting on a smooth horizontal surface. The man starts moving on the plank with speed u relative to the plank. The speed of the man relative to the ground is

Two particles of equal mass are moving along the same line with the same speed in the same direction. What is the speed of the centre of mass of the system ?

Two particles of equal mass are moving along the same line with the same speed in the same direction. What is the speed of the centre of mass of the system ?

A stone of mass m tied to a string of length l is rotated in a circle with the other end of the string as the centre. The speed of the stone is v. If the string breaks, the stone will move

Two particles of equal mass are moving along the same straight line with the same speed in opposite direction. What is the speed of the centre of mass of the system ?

Two particles of equal mass are moving along the same straight line with the same speed in opposite direction. What is the speed of the centre of mass of the system ?

AAKASH INSTITUTE ENGLISH-SYSTEM OF PARTICLES AND ROTATIONAL MOTION-Assignment (Section - A) Objective Type Questions (One option is correct)
  1. Locate the centre of mass of arrangement shown in figure. The three ro...

    Text Solution

    |

  2. A particle of mass m is thrown horizontally from the top of a tower an...

    Text Solution

    |

  3. A child is standing at one end of a long trolley moving with a speed v...

    Text Solution

    |

  4. A man of mass m moves on a plank of mass M with a constant velocity u...

    Text Solution

    |

  5. Two blocks of masses 5kg and 2kg are connected by a spring of negligib...

    Text Solution

    |

  6. A body falling vertically downwards under gravity breaks in two parts ...

    Text Solution

    |

  7. A body at rest breaks into two pieces of equal masses. The parts will ...

    Text Solution

    |

  8. Let I(A) and I(B) be moments of inertia of a body about two axes A and...

    Text Solution

    |

  9. The moment of inertia of a cylinder of mass 1000gm and radius 20cm abo...

    Text Solution

    |

  10. The angular momentum changes from 4 unit to 10 unit in 2 seconds. The ...

    Text Solution

    |

  11. A constant torque of 400Nm turns a wheel of moment of inertia 100kg m^...

    Text Solution

    |

  12. The masses of two uniform discs are in the ratio 2 : 1 and their radii...

    Text Solution

    |

  13. If the torque acting on a system is zero then, which of the followin q...

    Text Solution

    |

  14. The moment of inertia of a thin uniform rod about an axis passing thro...

    Text Solution

    |

  15. A rigid body of moment of inertia l has an angular acceleration alpha....

    Text Solution

    |

  16. A flywheel rotates about a fixed axis and slows down from 300 r.p.m to...

    Text Solution

    |

  17. A body starting from rest gains an angular speed of 540 r.p.m in 6 sec...

    Text Solution

    |

  18. A ring of mass 6kg and radius 40cm is revolving at the rate of 300 rpm...

    Text Solution

    |

  19. A ring of mass 10kg and diameter 0.4m is rotated about an axis passing...

    Text Solution

    |

  20. If radius of the earth contracts to half of its present value without ...

    Text Solution

    |