physics question

Question

An 87 kg skier enters the bottom of a 3.12 m Ski Jump at 7.0 m/s. Assuming no friction on the jump:

a) What is the net force on the skier while going up the 38° Jump? Ans: -525. N

b) What is the skier’s acceleration on the jump? Ans: -6.03 m/s^2

c) What is their speed at the top of the jump if there was no friction? Ans: 3.37m/s

idk how to do this?

Answer 1

(a) Net force will be force due to gravity down the ramp = mg sin θ, where θ is the angle of elevation of the ramp.

(b) Use F=ma. Use F from part (a).

(c) Use v² = u² + 2as. u = 7, s = 3.12, a you get from (b)