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An elevator platform is going up at speed of 20 m sand during its upwards...

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An elevator platform is going up at speed of 20 m sand during its upwards motion a small ball of mass 5 g falling in downward direction strikes the platform with speed 5 ms w r t ground and rebounds perfectly elastically The speed with which ball will rebound is O 25 m s 1 O 35 m s 1 40 m s 1 O 45 m s

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