(b) a car of mass 3000 kg travels at a constant velocity of 5.0 m/s.
calculate the time it would take a force of 4500 n to accelerate the car to a
velocity of 30.0 m/s.
give your answer correct to two significant figures (sf).
select an equation from the list of equations at the end of this paper.

(3)
time =

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)