Q.

A uniform solid spherical ball is rolling down an inclined plane from a height h. The velocity attained by the ball when it reaches the bottom of the inclined plane is v. If the ball is now thrown vertically upwards with the same velocity v, the maximum height to which the ball will rise is

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a

5h8

b

3h5

c

5h7

d

7h9

answer is C.

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Detailed Solution

c) Total kinetic energy of a body which is rolling without slipping is given by
 Ktotal=Krot+Ktrans
For solid spherical ball I=25mR2  and  v=Rω (Along the diameter)
Where, R is radius of spherical ball.
 So,Ktotal=12(25mR2)ω2+12mR2ω2=710mv2
Now potential energy = kinetic energy 
mgh=710mv2v2=107gh ……………..(i)
For vertical projection,  v2=u2+2gh'107gh=o+2gh'h'=57h
 

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