Home
Class 11
PHYSICS
A block of mass 5 kg is initially at res...

A block of mass `5 kg` is initially at rest on a rough horizontal surface. A force of `45 N` acts over a distance of `2 m`. The force of friction acting on the block is `25 N`. The final kinetic energy of the block is

A

40 J

B

90 J

C

50 J

D

140 J

Text Solution

Verified by Experts

The correct Answer is:
A
`Delta K = W , K.E_(f) - 0 = F_("net") S cos theta`.
Promotional Banner

Topper's Solved these Questions

  • WORK POWER AND ENERGY

    NARAYNA|Exercise Level- III (C.W)|50 Videos

  • WORK POWER AND ENERGY

    NARAYNA|Exercise NCERT (Based Questions)|45 Videos

  • WORK POWER AND ENERGY

    NARAYNA|Exercise Level- I (C.W)|60 Videos

  • WORK , ENERGY & POWER

    NARAYNA|Exercise EXERCISE IV|43 Videos

Similar Questions

Explore conceptually related problems

A block of mass 4 kg is initially at rest on a horizontal frixtionless surface. A horizontal force vec(F) = (3+x) hat(i) newtons acts on it, when the block is at x = 0 . The maximum kinetic energy of the block between x = 0 and x = 2 m is

A block of mass 2 kg, initially at rest on a horizontal floor, is now acted upon by a horizontal force of 10 N . The coefficient of friction between the block and the floor is 0.2. If g = 10 m//s^(2) , then :

A block of mass m is placed on a rough horizontal surface. If minimum force to pull the block is (mg)/(2) then coefficient of friction is :

A 20 kg block is initially at rest on a rough horizontal surface. A horizontal force of 75 N is required to set the block in motion. After it is in motion, a horizontal force of 60 N is required to keep the block moving with constant speed. The coefficient of static friction is

A 10 kg block is initially at rest on a rough horizontal surface. A horizontal force of 60 N is required to set the block in motion . After it is in motion , a horizontal force of 50 N is required to keep the block moving with constant velocity . The ratio coefficient of static and kinetic friction is

A block of mass 4 kg is initially at rest on a horizontal frictionless surface. A force vec(F) = (2x+3x^(2))hat(i) N acts horizontally on it. The maximum kinetic energy of the block between x = 2m and x=4m in joules is

A block of mass 1 kg in kept on a rough horizontal surface with mu_(s)=0.1 . A force of 0.5 N is applied as shown in the figure. What is the frictional force applied by ground on the block?

A block of mass 5 kg is at rest on a rough inclined surface. If angle of inclination of plane is 60^(@) , then force applied by it on block is

A block of mass 5kg is resting on a rough surface as shown in the figure. It is acted upon by a force of F towards right. Find frictional force acting on block when 25N.

A 2.5 kg block is initially at rest on a horizontal surface. A horizontal force vecF of magnitude 6.0 N and a vertical force vecP are then applied to the block (Fig. 6-31). The coefficients of friction for the block and surface are mu = 0.40 and mu = 0.25 . Determine the magnitude of the frictional force acting on the block if the magnitude of vecP is (a) 8.0 N. (b) 10 N, and (c) 12 N

NARAYNA-WORK POWER AND ENERGY-Level- II (C.W)
  1. A bullet of mass 10 gm is fired horizontally with a velocity 1000 ms^(...

    Text Solution

    |

  2. A drop of mass 1.00 g falling from a height 1.00 km. It hits the groun...

    Text Solution

    |

  3. A block of mass 5 kg is initially at rest on a rough horizontal surfac...

    Text Solution

    |

  4. A block of mass 2 kg is initially at rest on a horizontal frictionless...

    Text Solution

    |

  5. A freely falling body takes 4s to reach the ground. One second after r...

    Text Solution

    |

  6. A vertically projected body attains the maximum height in 6s. The rati...

    Text Solution

    |

  7. Two blocks A and B, each of mass m, are connected by a masslesss sprin...

    Text Solution

    |

  8. A block of mass m = 25 kg on a smooth horizontal surface with a veloci...

    Text Solution

    |

  9. A body is thrown vertically up with certain initial velocity, the pote...

    Text Solution

    |

  10. A machine rated as 150 W, changes the velocity of a 10 kg mass from 4 ...

    Text Solution

    |

  11. A pump is required to lift 600 kg of water per minute from a well 25 m...

    Text Solution

    |

  12. A tank on the roof of a 20 m high building can hold 10 m^(3) of water....

    Text Solution

    |

  13. An electric fan, with effective area of cross-section 'A', accelerates...

    Text Solution

    |

  14. A point size mass 100 gm is rotated in a vertical circle using a cord ...

    Text Solution

    |

  15. A vehicle is travelling along concave road then along convex road of s...

    Text Solution

    |

  16. The length of a simple pendulum is 1 m. The bob is given a velocity 7 ...

    Text Solution

    |

  17. A body is allowed to slide down a frictionless track from rest positio...

    Text Solution

    |

  18. A body is mass m is rotating in a vertical circle of radius 'r' with c...

    Text Solution

    |

  19. A simple pendulum of length 'l' carries a bob of mass 'm'. If the brea...

    Text Solution

    |

  20. A body of mass 4kg moving with a speed of 3 ms^(-1) collides head on w...

    Text Solution

    |