A ball is thrown vertically upward, which is the positive direction. A little later, it returns to its point of release. The ball is in the air for a total time of 8.0s. What is its initial velocity

The initial velocity of the ball is 39.2 m/s in the upward direction.

Explanation:

Given:

Upward direction is positive. So, downward direction is negative.

Tota time the ball remains in air (t) = 8.0 s

Net displacement of the ball (S) = Final position - Initial position = 0 m

Acceleration of the ball is due to gravity. So, (Acting down)

Now, let the initial velocity be 'u' m/s.

From Newton's equation of motion, we have:

Plug in the given values and solve for 'u'. This gives,

Therefore, the initial velocity of the ball is 39.2 m/s in the upward direction.

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it is called kinetic energy