The closer to 100 percent a machine effeceny is the better it is at reducing

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up