Aball is thrown straight up from the ground with an unknown velocity. it returns to the ground after 4.0seconds. with what velocity did it leave the ground?

The ball was thrown at approximately .

Explanation:

Assuming that there is no air resistance (or drag) in this question, the time to go up is the same to go down. Therefore, we can assume that it takes 2 seconds to go up and then 2 seconds to go down (4 seconds in total).

On Earth's surface, gravity is approximately . Notice the meaning that gravity is given in terms of acceleration. As it's an acceleration, it means that velocity changes at a rate of 9.8 meters per second. As we have 2 seconds of deceleration going up, we have a starting speed of   = .

volts times amps 6 x 0.5 3w