Which of the following is not a shared similarity between warm-up and cool- down routines?
A. Stretches performed can be the same.
B. Consist of a modified version of the exercise performed, such as a
slow jog before or after a strenuous run.
C. Restore muscles to their resting length.
D. Help prevent injury.

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.