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Q)

From the top of a building 40 m tall, a ball a thrown vertically upwards with a velocity of $10\; ms^{-1}$ After how long will the ball hit the ground?

$\begin{array}{1 1} 4s \\ 3s \\ 2s \\7s\end{array} $

2 sec is the right answer
which is the right answer 2 or 4?

2 Answers

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