Physics-
General
Easy
Question
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 = 
. The body might be a -
- solid sphere
- hollow sphere
- disc
- ring
The correct answer is: disc
Let I bt the moment of inertia of the body. Then total KE = 
mv2 + I2
or KE = mv2 + I 
According to energy conservation loss in KE = gain in PE.
or 
v2 = mgh = mg
Solving this, we get I = mR2
i.e., the solid body is a disc
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