A particular sprinter reaches a horizontal acceleration of 13.4 m/s2 out of the starting block. The starting block is tilted such that the vertical component of the force which the starting block exerts on the sprinter compensates for the weight of the sprinter, leading to a zero vertical acceleration. What is the magnitude of the force with which the 63 kg sprinter pushes against the starting block? only those who will show the work clearly will get the extra bonus points.