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25 February, 03:24

A sky diver of mass 60kg can slow herself by adjusting her form to a constant speed of 90km/h ... magnitude of the drag force?

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  1. 25 February, 03:30
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    If the sky diver is at a constant speed, that means with her current aerodynamics she has reached her terminal velocity. This means that Force due to gravity = Drag, i. e. if you drew her on a free body diagram the downward and upward arrow would have the same magnitude.

    Assuming acceleration due to gravity to be 9.81ms^-2, we can work out the force due to gravity on the sky diver (also assuming she is on earth) i. e. her weight, to be 60*9.81 = 588.6N

    As she is at a constant velocity, the drag force will be equal to that, since a=f/m where f is the net force acting on the object. Therefore, the magnitude of the drag force is 588.6N
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