Body 'P' having mass M moving with |CENTREOFMASSJEEMain2021

JEE MAIN 2021

26-02-2021 S1

Question

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion 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 a maximum speed equal to '2u' after collision.
Reason R : During elastic collision, the momentum and kinetic energy are both conserved.
In the light of the above statements, choose the most appropriate answer from the options given below

Select the correct option:

A is not correct but R is correct.

Both A and R are correct but R is NOT the correct explanation of A.

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

A is correct but R is not correct

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

For e = 1 \& second body at rest $$ V_2=\frac{2 m_1 u_1}{m_1+m_2}=\frac{2 u(M)}{M+m} \simeq 2 u $$ Since $M \gg m$

Question Tags

JEE Main

Physics