UPSEE Solved Model Paper 7

When the paratrooper is dropped from the aeroplane, the parachute does not open for a white. During this time interval, its speed increases linearly with time.
Using the first equation of motion: v = u + at
Initial velocity, u = 0 [As paratrooper is dropped]
Acceleration, a = g (acceleration due to gravity)
⇒ v = 0 + gt = gt
⇒ v α t [as g = 9.8 m∕s2 : constant]
When the parachute opens, speed of the paratrooper decreases exponentially.
This is best illustrated by the graph in option 'D'.
Hence, option ’D' is correct