Noe (51.1 kg) is jumping on a trampoline and is able to reach a height of 2.4 m on his highest jump. When he lands on the trampoline, he depresses the trampoline by 0.582 m. If we treat the trampoline as a spring that has been compressed by 0.582 m, what is its spring constant?

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?