Solved: An object with cross section A is shot
Chapter 6, Problem 6.117(choose chapter or problem)
An object with cross section A is shot horizontally across frictionless ice. Its initial velocity is v0x at t0 = 0 s. Air resistance is not negligible. a. Show that the velocity at time t is given by the expression vx = v0x 1 + CrAv0x t/2m b. A 1.6-m-wide, 1.4-m-high, 1500 kg car with a drag coefficient of 0.35 hits a very slick patch of ice while going 20 m/s. If friction is neglected, how long will it take until the cars speed drops to 10 m/s? To 5 m/s? c. Assess whether or not it is reasonable to neglect kinetic friction
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