An Experiment That Can Be Used to Measure the Velocity

Multiple Choice

An experiment that can be used to measure the velocity of a bullet is to have two cardboard disks attached to a rotating shaft some distance apart and to measure the angular separation of the holes made by the bullet. In such an experiment, two cardboard disks are placed 0.534 m apart on a shaft that is rotating at 3000 rpm. The bullet is fired parallel to the axis and the angular separation of the holes is measured to be 22.0°. What is the speed of the bullet?

A) 72.8 m/s
B) 139 m/s
C) 219 m/s
D) 437 m/s
E) 1380 m/s