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Q.

Given below are two statements : one label as Assertion A and the other is labelled as Reason R.
Assertion(A): A body P having mass M moving with speed u has head on collision elastically with another body Q having mass m initially at rest. If m<<<M, body Q will have speed equal to 2u just after collision.
Reason(R): In elastic collision, only kinetic energy is conserved during collision

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a

Both A and R are correct and R is correct explanation of A

b

Both A and R are correct and R is not correct explanation of A

c

A is not correct but R is correct

d

A is correct but R is not correct

answer is C.

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Detailed Solution

For e=1 and second body at rest
$V_{2} = \frac{2 m_{1} u_{1}}{m_{1} + m_{2}}$

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Given below are two statements : one label as Assertion A and the other is labelled as Reason R.Assertion(A): A body P having mass M moving with speed u has head on collision elastically with another body Q having mass m initially at rest. If m<<<M, body Q will have speed equal to 2u just after collision.Reason(R): In elastic collision, only kinetic energy is conserved during collision