Your friend applies a horizontal force to your 2.0-kg physics textbook, which rests stationary against a vertical wall. The static and kinetic friction coefficients between the book and the wall are 0.20 and 0.15, respectively. With what force must your friend push on the book in order that it doesn’t slip down the wall?

A. 39 N
B. 20 N
C. 19.6 N
D. 25 N
E. 98 N


E. 98 N

Physics & Space Science

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A car weighing 5000 N is traveling along a straight level road powered by a forward drive force of 500 N. The force of air resistance is 200 N, and rolling resistance is 100 N. The net force on the car is

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Physics & Space Science