cq_1_051

"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.

&#Very good work. Let me know if you have questions. &#