course PHY 121

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?

8cm/s^2 * 3s = 24cm/s^2

###This should have been just 24cm/s

###This should be 12cm/s + 24cm/s = 36cm/s

answer/question/discussion:

• Assuming that acceleration is constant, what will be its average velocity during this interval?

24cm / 3s = 8cm/s

###This is 12cm/s + 24cm/s / 2 = 24cm/s

answer/question/discussion:

• How far will it travel during this interval?

8cm/s * 3 = 24cm

###This is 24cm/s*3s = 72cm