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Sagot :
The question is incomplete. The complete question is :
High-speed stroboscopic photographs show that the head of a 200 g golf club is traveling at 60 m/s just before it strikes a  50 g golf ball at rest on a tee. After the collision, the club head travels (in the same direction) at 40 m/s. Find the speed of the golf ball just after impact.
Solution :
We know that momentum = mass x velocity
The momentum of the golf club before impact = 0.200 x 60
                                       = 12 kg m/s
The momentum of the ball before impact is zero. So the total momentum before he impact is 12 kg m/s. Therefore, due to the conservation of momentum of the two bodies after the impact is 12 kg m/s.
Now the momentum of the club after the impact is = 0.2 x 40
                                          = 8 kg m/s
Therefore the momentum of the ball is = 12 - 8
                                = 4 kg m/s
We know momentum of the ball, p = mass x velocity
                           4 = 0.050 x velocity
∴ Velocity =  [tex]$\frac{4}{0.050}$[/tex]
         = 80 m/s
Hence the speed of the golf ball after the impact is 80 m/s.
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