Which force best represents fg? a. a weight lifter is pushing a barbell upward with a force of 90 n. b. the weight of a barbell acting on a weight lifter is 80 n. c. the amount of upward force of a table on a box is 25 n. d. a box on a rough table has difficulty sliding past 25 n of force.

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.