Question

Assertion :During head on collision between two bodies let $\Delta p_1$ is change in momentum of first body and $\Delta p_2$ the change in momentum of the other body, then $\Delta p_1=\Delta p_2$. Reason: Total momentum of the system should remain constant.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is D Assertion is incorrect but Reason is correct

Since there is no external force acting on the system of two bodies, momentum will be conserved.
$\Delta p_1+\Delta p_2=0$;
$\Rightarrow \Delta p_1=-\Delta p_2$;
$\left|\Delta p_1\right|=\left|\Delta p_2\right|$;
Magnitudes of $\Delta p_1$ and $\Delta p_2$ are same but directions are opposite.
Assertion: Incorrect
Reason: Correct.