A ballon is rising vertically upwards at a velocity of 3m/s. WHen it is at a height of 45m from the ground, a parachutist bails out from it. After 3s he opens his parachute and decelerates at constant rate of 5m/s. What was the height of parachutist above the ground when he opened his parachute? Tage g = 10m/s-2.