Cracking the SAT Physics Subject Test

Here’s How to Crack It

The kinetic energy of the ball as it leaves the cue is

K = mv^2 = (0.25 kg)(2 m/s)^2 = 0.5 J

The work W done by the cue gave the ball this kinetic energy, so

Note that this could have been solved by using Fnet = ma to find the acceleration,

and then using Big Five #5 to find the displacement.