A 120 g ball moving to the right at 4.0 m/s catches up and collides with a 420 g

Question

A 120 g ball moving to the right at 4.0 m/s catches up and collides with a 420 g ball that is moving to the right at 1.1 m/s

A) If the collision is perfectly elastic, what is the speed of the 120 g ball after the collision?

B) If the collision is perfectly elastic, what is the direction of motion of the 120 g ball after the collision?

C)If the collision is perfectly elastic, what is the speed of the 420 g ball after the collision?

D)If the collision is perfectly elastic, what is the direction of motion of the 420 g ball after the collision?

Explanation / Answer

A. apply V1 = (m2-m1) u1 /(m1+m2)

V1 = (0.42-0.12)* 1.1/(0.12+ 0.42)

V1 = 0.611 m/s

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B. direction is to the right
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C.. V2 = 2m2u1/(m1+m2)

V2 = 2 * 0.42 * 1.1/(0.12+ 0.42)

V2 = 1.711 m/s
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D. direction is to the right

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