A ball is thrown straight up into the air from the ground with a speed of 10 m/s. What is the maximum height the ball will reach? How much time will it take the ball to fly up and then reach the ground again?

5 m, 2 s

Explanation:

gravity is roughly 10 m/s²downward

That means in one second, the velocity will have been reduced to zero

The average speed is (10 + 0) / 2 = 5 m/s

h = vt = 5(1) = 5 m

It will take as long to fall back to the thrower from rest so total flight is 1 + 1 = 2 s

they should be similar or the same

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.