Need answer asap what are the factors that affect the strength of a frictional force? the acceleration of the object the color and density of an object the bouyant forces acting on an object the mass of an object and how rough the surface is

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

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.

Which sound characteristic is not affected by the relative motion of an object