A 58-kg student weighs himself by standing on a force scale mounted on a skateboard that is rolling down an incline, as shown in the figure below.

A 58-kg student weighs himself by standing on a force scale mounted on a skateboard that is rolling down an incline, as shown in the figure below. Assume there is no friction so that the force exerted by the incline on the skateboard is normal to the incline. What is the reading on the scale if θ = 30°? Picture is attached