A body of radius R and mass m is rolling horizontally without slipping with speed v . It then rolls up a…

A body of radius R and mass m is rolling horizontally without slipping with speed v. It then rolls up a hill to a maximum height h=3v24g. The body might be a 
  1. solid sphere
  2. hollow sphere
  3. disc
  4. ring

Solution

Let I bt the moment of inertia of the body. Then total KE=12 mv2+12 Iω2

or KE=12 mv2+12 Iv2R2ω=vR

According to energy conservation loss in KE=gain in PE.

or 12m+IR2v2=mgh=mg3v24g

Solving this, we get I=12mR2

i.e., the solid body is a disc

Asked in: JEE Mains - Rotational Motion - Chapter Test

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