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Q.

The distance travelled by a falling body in the last second of its motion, to that in the last but one second is 7:5, the velocity (in m/sec) with which body strikes the ground is….

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answer is 39.2.

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Detailed Solution

g(n−1/2)g(n−3/2)=75⇒n=4 v=gt=39.2m/s

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The distance travelled by a falling body in the last second of its motion, to that in the last but one second is 7:5, the velocity (in m/sec) with which body strikes the ground is….