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A rock of mass 32 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 275 N. What is the magnitude of the acceleration of the rock?

  • physics -

    (Weight - 275 N)/Mass = acceleration

    Weight = 313.6 N

    a = (313.6-275)/32 = 1.2 m/s^2

    This accleration can only apply for an instant

    Actually, acceleration will decrease and velocity and air resistance will increase until a limiting velocity is reached and acceleration becomes zero. This is a misleading problem.

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