what is meant by velocity and acceleration and find the velocity of the object if the speed is 9.8ms and its height is 15m and initial velocity is 19ms.
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Given,
Take initial velocity u=9.81m/s
Acceleration is downward a=−g=−9.81m/s
2
When the body come to the ground, it has equal velocity in magnitude but opposite in direction.
Final velocity v=−u
Apply kinematic equation
v=u+at
−u=u−gt
t=
g
2u
=
9.81
2×9.81
=2sec
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