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  4. A Girl throws a s ball upwards with initial speed 50ms- 1 . The time taken by the ball to return to her hands is(Take g=10ms- 2 )

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Q. A Girl throws a s ball upwards with initial speed $50ms^{- 1}$ . The time taken by the ball to return to her hands is(Take $g=10ms^{- 2}$ )

NTA AbhyasNTA Abhyas 2020

Solution:

Solution
$using \, , \, S=ut+\frac{1}{2}at^{2}$
$Here \, S=0, \, u=50 \, m \, s^{- 1}, \, a=-g=-10 \, ms^{- 2}$
$\therefore 0=50t+\frac{1}{2}\times \left(- 10\right)t^{2}=50t-5t^{2 \, }t=10 \, s$