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

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