Halliday, Resnick & Walker — Kinetic Energy and Work: Problem 20

20 A block is sent up a frictionless ramp along which an x axis extends upward. Figure 7-24 gives the kinetic energy of the block as a function of position x; the scale of the figure’s vertical axis is set by \( K_s = 50.0 \text{ J} \). If the block’s initial speed is \( 5.00 \text{ m/s} \), what is the normal force on the block?