Trouble with mechanical physics

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To solve the trampoline artist's problem, apply the conservation of mechanical energy to determine his landing speed, considering gravitational potential energy changes. For the trampoline's depression, utilize Hook's law with the spring constant provided. The sports car's average power calculation requires converting speed to meters per second and using the formula for power, which involves work done over time. Clarification on energy conservation and the correct application of formulas is essential for accurate results. Understanding these principles will aid in resolving both physics problems effectively.
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A 70 kg trampoline artist jumps vertically upward from the top of a platform with a speed of 4.5 m/s. (Ignore small changes in gravitational potential energy.

(a) How fast is he going as he lands on the trampoline, 3.0 m below?
m/s
(b) If the trampoline behaves like a spring with spring stiffness constant 5.2 multiplied by 104 N/m, how far does he depress it?
m

I think i have to use kinematics but I don't really know how to execute it

A 1400 kg sports car accelerates from rest to 80 km/h in 7.4 s. What is the average power delivered by the engine?
I put 112000 W but it is wrong and I don't know what to do to get it write

please help me with one or both of these that would be great
 
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For part (a), think about the conservation of mechanical energy. (E=\frac{mv^2}{2}+mgh).

For part (b), use Hook's law. (Check out wikipedia or google it).
 

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