A parachutist falls from an aircraft and reaches a terminal velocity. After a while he opens
his parachute and reaches a new (lower) terminal velocity. Which graph shows how the air resistance (drag) force acting on him varies with time during the fall?

Answer:

27) A

As soon as the parachutist falls from the aircraft, air resistance (drag force) immediately acts against him and starts to increase.

Soon after, the drag force will become equal to the weight of the parachutist. They will reach a terminal velocity.

As soon as the parachutist open his parachute, the drag force increase greatly as air resistance acts on the parachute as well as the individual.

As the velocity of the parachutist decreases, the drag force also decreases, reaching the same terminal velocity. Hence, A is the correct answer.