"The problem: A ball accelerates at 8 cm/s^2 for 3 seconds, starting with velocity 12 cm/s. • What will be its velocity after the 3 seconds has elapsed? answer/question/discussion: Answer: dv = ave acc * dt = 8cm/s/s * 3sec = 24cm/s, 12cm/s + 24cm/s = 36cm/s. • Assuming that acceleration is constant, what will be its average velocity during this interval? answer/question/discussion: Answer: ave vel = (vf+v0) /2 = 48cm/s / 2 = 24cm/s. • How far will it travel during this interval? answer/question/discussion: Answer: ds = ave vel * dt = 24cm/s * 3sec = 72cm.