## Fundamentals of Physics Extended (10th Edition)

Initially the 85kg sled is moving at 37m/s and it comes to a stop while decelerating at 2.0 $m/s^2$. Since F = ma and the acceleration is 2 $m/s^2$ then the Force is 85 * -2 = -170N. Since the negative denotes only direction, the answer is 170N