16) Cathy is in a wagon (m-200 kg) moving with an initial velocity of 3 m/s when she goes down a ramp (ex-30) a vertical distance of h 5 meters and a length of 10 m (d-10 m), if Cathy has a velocity of 8 m/s at the bottom of the ramp, what is the magnitude of the frictional force acting on the wagon she goes down the ramp?