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A rider on an open platform, which is de...

A rider on an open platform, which is descending at constant speed of 3 ms `s^(-1)`, throws a ball. Relative to platform, ball's initial velocity is horizontal at 12 m/s. The ground is 10m below the location where the ball is thrown:
(i) Where does the ball kit the ground?
(ii) How long after the ball hits the ground does the platform reach grond level?
(iii) With what velocity does the ball hit the ground?

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