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(A) In a head-on elastic collision between two bodies of equal mass,the velocities of the bodies are interchanged.Let the masses of the four balls be

Vedclass · Accepted Answer

$0.4$

Vedclass · Answer

(A) In a head-on elastic collision between two bodies of equal mass,the velocities of the bodies are interchanged.Let the masses of the four balls be $m_1 = m_2 = m_3 = m_4 = m$.The first ball has an initial velocity $v_1 = 0.4 \, m/s$ and the others are at rest $(v_2 = v_3 = v_4 = 0)$.When the first ball collides with the second,they exchange velocities: the first ball comes to rest,and the second ball moves with $v_2 = 0.4 \, m/s$.When the second ball collides with the third,they exchange velocities: the second ball comes to rest,and the third ball moves with $v_3 = 0.4 \, m/s$.This process continues until the last ball is hit.Therefore,the last ball will move with the velocity of the first ball,which is $0.4 \, m/s$.

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