strikes the platform at speed 5 m/s. Find the speed with which the ball rebounds.

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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.
24
Sep
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. An elevator platform is going up at a speed of 20 m/s [...]
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