posted by Erin .
A 10 m long frictionless ramp is inclined at an angle of 30 degress to the horizontal. A boy of mass 57 kg coasts down the incline on a skateboard of mass 3.0 kg. The acceleration due to gravity may be taken as 9.8 m/s^2 and the effects of air resistance can be ignored. a) Calculate the magnitude of the normal force acting on the skateboard and rider. b) what is the resultant force acting parallel to the ramp on board plus rider. c)what is the accelration of the boy down the ramp?
c) resultant force=mass*acceleration.
No friction force is present.