A platform is moving upwards with a constant acceleration of 2 m/sec 2 . At time t = 0, a boy standing on the platform throws a ball upwards with a relative speed of 8 m/sec. At this instant platform was at the height of 4m from the ground and was moving with a speed of 2 m/sec. Take g = 10 m/sec 2 . Find
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Sol. 
m, 9m, 
m
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