course PHY 121

The problem:A ball is moving at 10 cm/s when clock time is 4 seconds, and at 40 cm/s when clock time is 9 seconds.

• Sketch a v vs. t graph and represent these two events by the points (4 sec, 10 cm/s) and (9 s, 40 cm/s).

answer/question/discussion:

• Sketch a straight line segment between these points.

answer/question/discussion:

• What are the rise, run and slope of this segment?

**40cm/s-10cm/s=30cm/s

**9s-4s=5s

**30/5=6

###This should be 6cm/s^2

answer/question/discussion:

• What is the area of the graph beneath this segment?

??I don’t know??

###The altitude would be calculated by 40cm/s + 10cm/s=50cm/s / 2 = 25cm/s

The width would be the time interval of 9s - 4s= 5s

The area would be 25cm/s * 5s= 125cm