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.

hi there!

your question asks at which segment does freezing occur.

since we're talking about water, the freezing point of water will be 32 degrees fahrenheit or below.

hope this ! ~

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.