A ball is moving with velocity 5m/s towards a heavy wall which is at rest as shown in figure. Assuming collision to be perfectly elastic, find the velocity of the ball immediately after the collision.
A
5m/s towards left
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B
0m/s towards left
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C
5m/s towards right.
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D
52m/s towards left.
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Solution
The correct option is A5m/s towards left Given, mass of the ball (m1) is very less as compared to the mass of the wall (m2) Speed of ball before collision (u1)=5m/s Speed of wall before collision (u2)=0m/s Let speed of ball after collision (v1)=vm/s Speed of wall after collision (v2)=0m/s In case of elastic collision, when m1<<m2 v1=−u1+2u2 ⇒v=−5+0=−5m/s i.e velocity of ball is 5m/s towards left.