Question

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.

Answer 1

Answer:

ANSWER

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