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 )

Question

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 ) (A) 5 s (B) 10 s (C) 15 s (D) 20 s

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="Solution" src="https://cdn.tardigrade.in/q/nta/p-kzcdcxok1vxpigxy.jpg" /> using , S=ut+(1/2)at2 Here S=0, u=50 m s- 1, a=-g=-10 ms- 2 ∴ 0=50t+(1/2)× (- 10)t2=50t-5t2 t=10 s

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

$5 s$

$10 s$

$15 s$

$20 s$

$u s in g, S = u t + \frac{1}{2} a t^{2}$
$Here S = 0, u = 50 m s^{- 1}, a = - g = - 10 m s^{- 2}$
$∴ 0 = 50 t + \frac{1}{2} \times (- 10) t^{2} = 50 t - 5 t^{2} t = 10 s$

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 )

5s

10s

15s

20s