Question

A ball is projected horizontally from the top of the tower 100 M with a velocity of 5 metre per second calculate the time taken by the ball to reach the ground

Answer 1

There does'nt matters the horizantal velocity
The horizantal velocity can be at any value, it effects only the range but it doesn't effect the time because vertical velocity is 0

NOW,
$t = \sqrt{ \frac{2h}{g} }$
$t = 2 \sqrt{5}$
Here is your answer

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