How long till the ball reaches its highest point

Question

An elementary student kicks a ball straight into the air with a velocity of 16 feet/sec. If acceleration due to gravity is -32 ft/sec², how many seconds after it leaves his foot will it take the ball to reach its highest point? Assume the position at time t = 0 is 0 feet.

Question options:

1)	1.25
2)	6
3)	0.50
4)	Cannot be determined

Answer 1

Every second, the ball decreases its speed by 32 ft/s.

That means that every half of a second, the ball decreases its speed by 16 ft/s.

Because the ball starts off at 16 ft/s, it will take 1/2 of a second for it to reach 0 ft/s.