Experiment shows that the frictional drag force F of a car moving in air depends on the velocity V of it's motion, density P of the air through which it travels, and the cross-sectional area of the car. if the force is F = KP^x V^2y A ^z. Where x, y and z are the integers and k is a dimensionless constant, find the values of x, y and z.

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?