alayn h uderstands the half life of a certain substance is 90days. how long would it take for 80lbs of her substance to be reduced to 20lbs

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

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.

What is the coefficient of kinetic friction μk between the block and the tabletop?