Which of the following is a unit of speed?
a) h
b) nm
c) cm/y
d) km/s^2

Which of the following represents an upright image? a. -do b. +m c. -m d. +do

Why do astronauts in the space shuttle weigh less?

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?