i need help with figureing out this problem A sled of mass 57 kg is pulled along snow-covered, flat ground. The static friction coefficient is 0.30, and the sliding friction coefficient is 0.10. What force will be needed to start the sled moving? Once moving, what total force must be applied to the sled to accelerate it 4.6 m/s2? What force is needed to keep the sled moving at a constant velocity? I figured out the weight, but i need the formula to figure out the rest.