A cliff diver pushes off horizontally from a cliff and lands in the ocean 2.00s later. How fast was he going when he entered the water?

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

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.

Due in 40 explain in terms of frame of reference if you’re inside a moving train everything on the outside can seem to be moving