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  • 6 A ball is thrown vertically up with a Velocity of  <img alt="4.9 \mathrm{~m} / \mathrm{s}" src="https://entrancecorner.oncodecogs.com/gif.latex?4.9%20%5Cmathrm%7B%7Em%7D%20/%20%5Cmathrm

6 A ball is thrown vertically up with a Velocity of  4.9 \mathrm{~m} / \mathrm{s} . The ball is then collected by the person on ground after a time interval of -

Option: 1

3.0 \mathrm{sec}


Option: 2

2.0 \mathrm{sec}


Option: 3

1.0 \mathrm{sec}


Option: 4

0.5 \mathrm{sec}


Answers (1)

best_answer

Ball thrown up and then it returns to the person, the displacement of ball along  y axis is zero,  (y=0)

\therefore \quad y =u t-\frac{1}{2} g t^2 \\

0 =4.9 t-\frac{1}{2} 9.8 t^2 \\
4.9 t =\frac{1}{2} 9.8 t^2 \\
4.9 t =4.9 t^2 \\
t^2 =1, t= \pm 1 \mathrm{sec} \\
t=1 \mathrm{sec}
 

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Sayak

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