(! will give brainliest answer) the coaster below starts from rest at point a. it has a mass of 872 kg. there is no friction or air resistance. point a is 50 meters above ground. point b is 20 meters above ground. calculate the speed of the coaster at point b. a) 24 m/s b) 50 m/s c) 20 m/s

The passage that directs air to the lungs is called a. diaphragm. b. larynx. c. bronchi. d. pharynx.

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 are atoms of the same element with varying number of neutrons