Which of the following is an example of a pushing force changing the direction in which an object is moving?
A.
a push from behind on a moving swing
B.
a push from the front on a moving toy car
C.
a push from the side on a moving merry-go-round
D.
all of these

Most short-period comets do not have randomly oriented orbits because

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?

What describes the particles in a liquid