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  4. A ball is projected horizontally with a velocity of 5 m/s from the top of a building 19.6 m high. How long will the ball take of hit the ground ?

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Q. A ball is projected horizontally with a velocity of $5 \,m/s$ from the top of a building $19.6\, m$ high. How long will the ball take of hit the ground ?

WBJEEWBJEE 2010Motion in a Plane

Solution:

The time taken to hit the ground is given by
image
$T=\sqrt{\frac{2 H}{g}}$
$=\sqrt{\frac{2 \times 19.6}{9.8}}=2 \,s$