A100 kg cart, initially at rest, rolls down a 20 m high frictionless hill. at the bottom, the cart stops after plowing 2.0 m into crash cushions. determine the average force of the crash cushions on the cart while stopping it.

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i just did this and got a 100.

anchor = archer //

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west