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OP warned about not using the homework template

I need help, ive been staring at this problem for over an hour and trying to find similar problems online with no luck.

A 65 kg person is skiing down a hill. The skier's speed at the bottom is 15 m/s. If the skier hits a snowdrift and stops in .30s A)how far does the skier go into the drift? B)With what average force will he stike the drift? (his accel. is not constant)

for A would it be x=x_i+v_i t+1/2at^2 with a=-50m/s^2?

I think i can find B once I find A but a kick in the right direction would be great

A 65 kg person is skiing down a hill. The skier's speed at the bottom is 15 m/s. If the skier hits a snowdrift and stops in .30s A)how far does the skier go into the drift? B)With what average force will he stike the drift? (his accel. is not constant)

for A would it be x=x_i+v_i t+1/2at^2 with a=-50m/s^2?

I think i can find B once I find A but a kick in the right direction would be great