Question

a ball is is moving with speed 20m/s collides with a smooth surface.The magnitude of changer in velocity of the ball will be

Answer 1

Here, since it is not given a type of Collison ( elastic, inelastic, etc.) .... s

So, just by conservation of linear momentum it will solve.

Mu=Mv

V=u

V=20m/sec

If u had another answer.. tell me... i will tell u a concept of Collison