Q121 / 150 · MHT CET 2017 · Physics

A solid sphere of mass 2 kg is rolling on a frictionless horizontal surface with velocity 6 m s-1. It collides on the free end of an ideal spring whose other end is fixed. The maximum compression produced in the spring will be (Force constant of the spring = 36 N m-1).

  • A
    14 m
  • Correct answer
    B
    2.8 m
  • C
    1.4 m
  • D
    0.7 m

Solution

Kinetic energy of rolling solid sphere
=12mV2+12Iω2
=12mV2+12×25mr2ω2
=12mV2+15mV2
=710mV2
The potential energy of the spring on maximum compression x
=12kx2
∴    12kx2=710mV2
x2=1410mV2k
=1410×26236  
=2.8
x=2.8 m

Hence, the correct answer is option: 'B'.

Relevant Questions