Skip to content

Question

A parachutist falls freely for 2.5s before opening the parachute, then decelerates at 4m/s2 to hit the ground at 5m/s. What is the total time of descent? (Take g\=10m/s2)

Options

Choose one · Correct answer highlighted

Explanation

Free fall: v=gt=10⋅2.5=25m/s. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 6 s as the result, so option A is correct.