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A scientist with a stopwatch says that h...

A scientist with a stopwatch says that he can measure the speed at which he throws a stone upward. What do you think his method is?

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The time taken by the stone to come back to the ground is `t = 2u/g` . Where u is the velocity of the stone to start. Now `u = gt/2` , hence knowing the time t taken by the stone to come to the ground, u can be calculated.
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