Question

A body is projected vertically upwards with a velocity of 98 m/sec. What is the time for which body
will remain in air.
g =9.8 m / s

Answer 1

Answer:20 secs

Explanation:

See attached files

Answer 2

Given that,

Initial velocity of a body is 98 m/s

To find,

The time for which body  will remain in air.

Solution,

Let t is the time for which the body will remain in air. Using first equation of motion,

$v=u+at$

v = 0 and a = -g

$u=gt\\\\t=\dfrac{u}{g}\\\\t=\dfrac{98}{9.8}\\\\t=10\ s$

For the time of 20 seconds, the body will remain in air.

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Kinematics

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