Home
Class 11
PHYSICS
A ball of mass 1 kg strink a heavy platf...

A ball of mass `1 kg` strink a heavy platform, elastically, moving upwards with a velocity of `5 m//s`. The speed of the ball just begore the collision is `10 m//s` downwards. Then the impulse imparted by the platform on the ball is :-

A

`15 N-s`

B

`10 N-s`

C

`20 N-s`

D

`30 N-s`

Text Solution

Verified by Experts

The correct Answer is:
D
`e = - ((v_(2) - v_(1))/(u_(2) - u_(1))) rArr 1 = - (5 - v_(1))/(5 - (-10)) = (v_(1) - 5)/(15)`
`rArr v_(1) = 20 m//s`
`:.` Impulse on ball `= m(vec(v) - vec(u)) = 1 xx [20 -(10)] = 30N-s`
Promotional Banner

Topper's Solved these Questions

  • CENTRE OF MASS

    ALLEN|Exercise EXERCISE-II|43 Videos

  • CENTRE OF MASS

    ALLEN|Exercise EXERCISE-III|42 Videos

  • CENTRE OF MASS

    ALLEN|Exercise EXERCISE-V B|19 Videos

  • BASIC MATHEMATICS USED IN PHYSICS &VECTORS

    ALLEN|Exercise EXERCISE-IV ASSERTION & REASON|11 Videos

  • ELASTICITY, SURFACE TENSION AND FLUID MECHANICS

    ALLEN|Exercise Exercise 5 B (Integer Type Questions)|3 Videos

Similar Questions

Explore conceptually related problems

If a ball is thrown vertically upwards with a velocity of 40m//s , then velocity of the ball after 2s will be (g = 10m//s^(2))

A cricket ball of mass 0.5 kg strikes a circket bat normally with a velocity of 20" m s"^(-1) and rebounds with a velocity of 10" m s"^(-1) . The impulse of the force exerted by the ball on the bat is

A ball of mass 5 kg travelling with velocity of 15 cm/s makes a head on collision with another ball of mass 1 kg which is at rest. After the collision, the speed of the lighter ball is

A ball is thrown vertically upward from the 12 m level with an initial velocity of 18 m//s. At the same instant an open platform elevator passes the 5 m level, moving upward with a constant velocity of 2 m//s. Determine ( g = 9.8 m//s^2 ) (a) when and where the ball will meet the elevator, (b) the relative velocity of the ball with respect to the elevator when the ball hits the elevator.

A ball of mass m approaches a heavy wall of mass M with speed 4 m/s along the normal to the wall. The speed of wall before collision is 1m/s towards the ball. The ball collides elastically with the wall. What can you say about the speed of the ball after collision? Will it be slightly less than or slightly higher than 6 m/s ?

A ball of mass M moving with speed v collides perfectly inelastically with another ball of mass m at rest. The magnitude of impulse imparted to the first ball is

A stationary ball weighing 0.25 kg acquires a speed of 10m/s when hit by a hockey stick. The impulse imparted to the ball is

A ball of mass 1 kg drops vertically on to the floor wit a speed of 25 m//s . It rebounds with an initial velocity of 10 m//s . What impulse acts on the ball during contact ?

A ball of mass m strikes a rigid walJ with speed u and rebounds with the same speed. The impulse imparted to the ball by the wall is

ALLEN-CENTRE OF MASS-EXERCISE-I
  1. Two blocks A(3 kg) and B(2 kg) resting on a smooth horizontal surface ...

    Text Solution

    |

  2. A cannon of mass 5m (including a shell of mass m) is at rest on a smoo...

    Text Solution

    |

  3. A shell is fired from a cannon with a velocity v (m//sec.) at an angle...

    Text Solution

    |

  4. A ball hits the floor and rebounds after an inelastic collision. In th...

    Text Solution

    |

  5. Three balls A, B and C are placed on a smooth horizontal surface. Give...

    Text Solution

    |

  6. A body of mass 1 kg strikes elastically with another body at rest and ...

    Text Solution

    |

  7. A small bucket of mass M kg is attached to a lone inextensible cord of...

    Text Solution

    |

  8. In the figure shown, a particle P strikes the inclined smooth plane ho...

    Text Solution

    |

  9. A ball of mass 2m impinges directly on a ball of mass m, which is at r...

    Text Solution

    |

  10. A body of mass 2 kg is projected upward from the surface of the ground...

    Text Solution

    |

  11. A ball of mass 1 kg strink a heavy platform, elastically, moving upwar...

    Text Solution

    |

  12. Two particles of mass m, constrained to move along the circumference o...

    Text Solution

    |

  13. Two objects move in the same direction in a straight line. One moves w...

    Text Solution

    |

  14. A uniform rope of linear mass density lambda and length l is coiled on...

    Text Solution

    |

  15. A 10 g rubber ball and a 10g clay ball are each thrown at a wall with ...

    Text Solution

    |

  16. Two friends are sitting in a stationary boat. At t = 30s the person at...

    Text Solution

    |

  17. Two blocks, with masses m(1) 2.5 kg and m(2) = 14 kg, approach each ot...

    Text Solution

    |

  18. A small puck is sliding to the right with momentum vec(P)(1) on a hori...

    Text Solution

    |

  19. A smooth sphere is moving on a horizontal surface with velocity vector...

    Text Solution

    |

  20. A moving 2 kg ball with a speed of 2 ms^(-1) hits obliquely a stationa...

    Text Solution

    |