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Question

(A) When two objects of equal mass undergo a perfectly elastic head-on collision,they exchange their velocities.Let the masses of the four balls be $m

Vedclass · Accepted Answer

$0.4$

Vedclass · Answer

(A) When two objects of equal mass undergo a perfectly elastic head-on collision,they exchange their velocities.Let the masses of the four balls be $m_1 = m_2 = m_3 = m_4 = m$.The initial velocity of the first ball is $v_1 = 0.4\, m/s$,and the others are at rest $(v_2 = v_3 = v_4 = 0)$.$1$. Collision between ball $1$ and ball $2$: Ball $1$ comes to rest,and ball $2$ acquires velocity $0.4\, m/s$.$2$. Collision between ball $2$ and ball $3$: Ball $2$ comes to rest,and ball $3$ acquires velocity $0.4\, m/s$.$3$. Collision between ball $3$ and ball $4$: Ball $3$ comes to rest,and ball $4$ acquires velocity $0.4\, m/s$.Thus,the velocity of the last ball is $0.4\, m/s$.

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