physics

a 15gram bullet moving at 300m/s pass through z 2 cm thick sheet of foam and emerges with a speed of 90m/s find average force impeded its motion through the plastic.

asked by yonas
  1. Avg force * thickness
    = work done by bullet
    = kinetic energy loss

    Avg. force =
    0.015 kg*(1/2)*(300^2 - 90^2](m^2/s^2)/0.02 m
    = 3.07^10^4 N

    posted by drwls

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