1. The problem statement, all variables and given/known data A 60 kg person rides in a 20 kg cart moving at 13 m/s at the bottom of a valley that is in the shape of an arc of a circle with a radius of 36 m. What is the apparent weight of the person as the cart passes the bottom of the valley? 2. Relevant equations F_centripital = m*v^2/r F = ma 3. The attempt at a solution So this seems a little too easy to be correct. Apparent weight = m(a+g)=m(v^2/r+g) =60(13^2/36+9.80) =869.67 N The thing I am wondering about is the sign on gravity according to it being in the bottom of a valley. Is my work correct?