A student drops a small parcel from a bridge at a height of 4.5 m4.5\text{ m}4.5 m. The parcel hits the water below after 0.9 s0.9\text{ s}0.9 s. Calculate the average speed of the parcel as it falls. Use the equation: distance travelled=average speed×time\text{distance travelled} = \text{average speed} \times \text{time}distance travelled=average speed×time
The student draws a free body force diagram for the parcel as it falls: 
Identify the two forces represented by labels A and B.
Explain the motion of the parcel as it falls, referring to these forces.
A small car has a mass of 1200 kg1200\text{ kg}1200 kg. Calculate the force needed to accelerate the car at 2.5 m/s22.5\text{ m/s}^22.5 m/s2. Use the equation: force=mass×acceleration\text{force} = \text{mass} \times \text{acceleration}force=mass×acceleration