John bounces a ball off the ground, and it leaves the ground with a velocity of 10 m/s. how long will it take the ball to reach maximum height?

Explanation:

This is true because at maximum height, the velocity is 0

Gravity makes an upward-moving object move 9.8 m/s slower every second.

So if it leaves the ground at 10 m/s, it'll run out of upward speed in

(10 m/s) / (9.8 m/s²)  =  1.02 seconds

At that time, since it has no more upward speed, it'll start falling. So at that instant, it was exactly at its maximum height.

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.