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A bail of mass \( 0.250 \mathrm{~kg} \) that is moving with a spoed of \( 7.2 \mathrm{~m} / \mathrm{s} \) collides head-on and elastically with another ball initially at rest. Immodiately after the collsion, the incoming ball bounces backward with a speed of \( 3.0 \) \( \mathrm{m} / \mathrm{s} \). Calculate the velocity of the target ball after the collision. Express your answer to two significant figures and include the appropriate units.
A ball of mass \( 0,250 \mathrm{~kg} \) that is moving with a speed of \( 7.2 \mathrm{~m} / \mathrm{s} \) collides head-on and elastically with another ball initially at rest. Immediately after the collision, the incoming ball bounces backward with a speed of \( 3.0 \) Part B \( \mathbf{m} / \mathrm{s} \), Calculate the mass of the target ball. Express your answer to two significant figures and include the appropriate units.

Given: m1 = 0.250 kg m2 = ? v1i = 7.2 m/s v2i = 0 v1f = -3 m/s v2f = ?

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