Question

A ball is thrown upwards with a velocity of 20 meter per
second what will be velocity of the ball when it reaches
the height of lo meter?
A) 28.56 m/s
B) 14.28 m/s
c)25.42 m/s
D) 12.48 m/s​

Answer 1

Initial velocity of the ball = final velocity =0m/s

acceleration due to gravity (g)=−10m/s 2 (upward motion)

By using the formula,

v=u+at

O=25+(−10)×t

10t=25

t=2.5sec.

The time taken for upward journey is equal to the time taken for downward journey.

Therefore, total time taken by the ball =2.5+2.5=5sec.