a 115 kg football player moves a 135 kg training sled with a constant velocity. the ground has a u= 0.4. determine the amount of traction the football player has.​

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

An automobile steering wheel is shown. what is the ideal mechanical advantage? if the ama is 8, what is the efficiency of the steering wheel?

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?