A solid sphere rolls on a rough horizontal surface with a linear speed 7 m/s collides elastically with a fixed smooth vertical wall. Then the speed of the sphere when it has started pure rolling in the backward direction in m/s is.
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Ans. 0003
Sol. Let after time t Sphere starts pure rolling then,
v = 7 – μ gt ….(1)
and 
= 
+ 
….(2)
From (1) and (2) v = 3 m/s
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