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An elevator platform is going up at a speed of `20 m//s` and during its upward motion a small ball of `50 g` mass, falling in downward direction, stri

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An elevator platform is going up at a speed of `20 m//s` and during its upward motion a small ball of `50 g` mass, falling in downward direction, strikes the platform at speed `5 m//s`. Find the speed with which the ball rebounds.
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The situation is analysed in the figure. There we can consider mass of platform to be very large compared to that of the ball so we have
`vecv_(1)=vecu_(1)` and `vecv_(2)=2vecu_(1)-vecu_(2)`
Thus rebound velocity of the ball is
` vecv_(2)=2xx20-(-5)=45m//s` upward
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