A dated box of dates, of mass 5.00 kg, is sent sliding up a

A dated box of dates, of mass 5.00 kg, is sent sliding up a frictionless ramp at an angle of ? to the horizontal. Figure gives, as a function of time t, the component vx of the box\'s velocity along an x axis that extends directly up the ramp. What is the magnitude of the normal force on the box from the ramp?