Q.

A parachutist after bailing out falls 50 m without friction. When parachute opens, it decelerates at 2 m/s2. He reaches the ground with a speed of 3m/s. At what height, did he bail out :

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a

293m

b

91m

c

182m

d

111m

answer is B.

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Detailed Solution

Velocity of a parachute after falling 50m

u=2g x 50=10g m/s 32=u2-2 x 2 x h 32=100g-4h h=243m The height at which parachute bails out,243+50=293m

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