Physics-
General
Easy
Question
In the given curved road, if particle is released from 
then
- Kinetic energy at
must be 
- Kinetic energy at may be zero
- Kinetic energy at must be less than
- Kinetic energy at must not be equal to zero
must be
may be zero
must be less than
must not be equal to zero
The correct answer is: Kinetic energy at may be zero
If the surface is smooth then the kinetic energy at never be zero
If the surface is rough, the kinetic energy at be zero. Because, work done by force of friction is negative. If work done by friction is equal to then, net work done on body will be zero. Hence, net change in kinetic energy is zero. Hence, (b) is correct If the surface is rough, the kinetic energy at must be lesser than . If surface is smooth, the kinetic energy at is equal to The reason is same as in (a) and (b)
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