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Classical Mechanics

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Moderate

Forces on a Skydiver

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A skydiver with a weight of -750 N is falling with a velocity of -50 m/s when he opens his parachute. Here the negative signs indicate the negative $y$-direction (downward). After opening the parachute, an upwards air resistance of 800 N acts on the skydiver.

If the skydiver reaches the ground 72 seconds after opening his parachute, how fast is he going when he lands?

A

$0\space m/s$

B

$0.65\space m/s$

C

$1.3\space m/s$

D

$3.0\space m/s$