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28-03-2019
Physics

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Physics question, please help?

A cue ball with mass 170 g hits the stationary number 8 ball, which has mass 160 g. The cue ball and the 8 ball move with a speed of 0.2 m/s and 0.3 m/s respectively after the collision. What was the speed of the cue ball before the collision?

A) 0.2502 m/s
B) 0.4823 m/s
C) 0.5008 m/s
D) 0.5319 m/s

Respuesta :

28-03-2019

0.4823 m/s

The initial velocity u1 of the ball=0

From the law of conservation of linear momentum.

m1u1+m2u2=m1v1+m2v2

(160×0)+(170×u1)=(160×0.3)+(170×0.2)

u1=0.4823m/s

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