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Question

The water drops fall at regular intervals from a tap of 9m above the ground. The 4th drop is leaving the tap at the instant, the first drop touches the ground. How high is the 3rd drop at that instant?

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Solution


Time taken by the first drop to reach the ground is given by:
9m=9.8t2t=0.96s
So, the interval between two drops is 0.32s. So, the distance of third drop from the ground is:
99.8×0.322=8m

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