A 65-kg trampoline artist jumps vertically upward from the top of a platform with speed of 5.0

Question:

A 65-kg trampoline artist jumps vertically upward from the top of a platform with speed of 5.0 m/s.
(a) How fast is he going as he lands on the trampoline, 3.0m below (Fig. 6-38)?
(b) If the trampoline behaves like a spring with spring stiffness constant 6.2 x 104 N/m, how far does he depress it?

3.0 m