Question

why initial velocity is zero in the kinetic energy​

Answer 1

Explanation:

Answer..;

So, when it is dropped from a height of h meters, at initial the velocity is equal to zero.

Then it slowly gains velocity due to gravitational force impact....

As the object reaches the ground, its potential energy decreases and kinetic energy..

because the velocity is maximum..

Thanks.

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Answer 2

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When the net force acting on an object is zero, the net work done by all the forces acting on the object is zero. When the net force acting on an object is not zero, then the net work done on the object is Wnet = Fnet·d. When a net force acts on an object, then the object accelerates, it changes its velocity.

Can we express the work done by the net force in terms of this change in velocity?

Assume an object is moving along a straight line and a constant force Fnet = ma is acting on the object. Then Wnet = ma·d. The work is proportional to the acceleration a. This acceleration causes a change in speed, a = (vf - vi)/∆t. For translational motion we have

Wnet = md (vf - vi)/∆t.

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