A0.12 kg body undergoes simple harmonic motion of amplitude 8.5 cm and period 0.20 s. (a) what is themagnitude of the maximum force acting on it? (b) if the oscillations are produced by a spring, what is the springconstant?

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.