A body P moving with a velocity of 20ms−1 collides with another body Q of same mass at rest. After collision P comes to rest. What is the velocity of the body Q ?
20ms−1
10ms−1
30ms−1
5ms−1
A
5ms−1
B
20ms−1
C
10ms−1
D
30ms−1
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Solution
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By using momentum conservation,we get, m1u1+m2u2=m1v1+m2v2 But m1=m2=m,u1=20ms−1,u2=0ms−1,v1=0ms−1,v2=? ⇒m×20+m×0=m×0+m×v2 ⇒v2=20ms−1.
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