# Q. 13.     A ball is thrown vertically upwards with a velocity of $49\; m/s$. Calculate                (ii) the total time it takes to return to the surface of the earth.

Let the time taken by the ball to reach the highest point be t

$\\v=u+at\\ 0=49+(-9.8)\times t\\ t=5\ s$

The same time t would be taken to come back to the ground from the highest point.

Therefore the total time it takes to return to the surface of the earth = 2t = 10 s.

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