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A platform is moving upwards with an acc...

A platform is moving upwards with an accelerations of `5ms^(-2)`. At the moment when its velocity is ` u = 3ms^(-1)`, a ball is thrown from it with a speed of `30 ms^(-1)` w.r.t. platform at an angle of `theta = 30^@` with horizontal. The time taken by the ball to return to the platform is

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