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A block of mass 10 kg is kept on ground....

A block of mass 10 kg is kept on ground. A vertically upward force `F=(20 t)N`, where `t` is the time in seconds starts on it at `t=0`.
(a) Find the time at which the normal reaction acting on the block is zero.
(b) The height of the block from ground at `t=10` sec.

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