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CBSE Class 10 Answered

A ball moving with a velovity v strikes a wall moving towards the ball with a velocity u. An elastic impact lasts for t seconds. Find the mean elastic force actiong on the block in terms of m,v,u and t. 
Asked by acv27joy | 22 May, 2018, 07:37: PM
answered-by-expert Expert Answer
Ball moves with speed v m/s towards the wall which is moving with speed u m/s towards the ball.
 
Hence the ball moves towards the ball with relative speed (u+v) m/s and is getting bounced in opposite direction with same speed.
 
change in momentum = 2×m×(u+v)
 
force = change in momentum / impact time = [ 2×m×(u+v) ] / t
Answered by Thiyagarajan K | 19 Jun, 2018, 03:43: PM

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