A body thrown up with a finite speed is caught back after 4 sec. The speed of the body with which it is thrown up is

10 m/sec

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20 m/sec

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30 m/sec

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40 m/sec

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Solution

The correct option is B 20 m/sec
Time of flight is given as $4$ seconds, comparing it with the formula $T = 2 u / g$ and putting $g = 10 m / s^{2}$ we get projection speed $u = 20 m / s$
Option B is correct .

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A body thrown up with a finite speed is caught back after 4 sec. The speed of the body with which it is thrown up is

The correct option is B 20 m/secTime of flight is given as 4 seconds, comparing it with the formula T=2u/g and putting g=10m/s2 we get projection speed u=20m/sOption B is correct .

The correct option is B 20 m/sec
Time of flight is given as $4$ seconds, comparing it with the formula $T = 2 u / g$ and putting $g = 10 m / s^{2}$ we get projection speed $u = 20 m / s$
Option B is correct .