1. A stroboscopic photo of a club hitting a golf ball, such as the photo shown in Figure 6.3, was made by Harold Edgerton in 1933. The ball was initially at rest, and the club was shown to be in contact with the club for about 0.0022 s. Also, the ball was found to end up with a speed of 1.9 102 ft/s. Assuming that the golf ball had a mass of 55 g, find the average force exerted by the club on the ball.
a = V / t = 1.9102 Ft/s / 0.0022 s,
= 865.3 Ft/s^2.
a = 865.3 ft/s^2/3.3 Ft/m = 262.2m/s^2.
F = ma = 0.055 kg * 262.2 m/s^2 N.
F = ma = 0.055 kg * 262.2 m/s^2=14.4 N.