Aball is launched with an initial velocity of 28.5 m/s at a 45° angle from the top of a cliff that is 10.0 m above the water below. use g = 9.80 m/s2 to simplify the calculations. note: you could answer these questions using projectile motion methods, but try using an energy conservation approach instead.

(a) what is the ball's speed when it hits the water?
m/s

(b) what is the ball's speed when it reaches its maximum height?
m/s

(c) what is the maximum height (measured from the water) reached by the ball in its flight?
m

2.

a boy reaches out of a window and tosses a ball straight up with a speed of 15 m/s. the ball is 30 m above the ground as he releases it. use energy to find the following.

(a) what is the ball's maximum height above the ground?
m

(b) what is the ball's speed as it passes the window on its way down?
m/s

(c) what is the speed of impact on the ground?