A body A, of mass m = 0.1 kg has an initial velocity of 3 i ms⁻¹. It collides elastically with another body, B of the same mass which has an initial velocity of 5 j ms⁻¹. After collision, A moves with a velocity v = 4(i + j). The energy of B after collision is written as x/10. The value of x is _ _ _ _ _ _.

Rotational Motion: JEE Main 2020 Physics question

JEE Main 2020 · 8 Jan, Morning shift · Q42

JEE Main 20208 Jan, Morning shiftPhysicsHardRotational Motion140× since 2002

A body A, of mass m = 0.1 kg has an initial velocity of 3

\widehat i

ms⁻¹ . It collides elastically with another body, B of the same mass which has an initial velocity of 5

\widehat j

ms⁻¹. After collision, A moves with a velocity

\overrightarrow v = 4\left( {\widehat i + \widehat j} \right)

. The energy of B after collision is written as

{x \over {10}}

. The value of x is ___________.

Your answerType your answer. Integers and decimals are accepted.

JEE Main 2020 Rotational Motion Question with Answer (8 Jan Morning shift, Q42) | JEE Arc