Describing Motion in One Dimension T ...

2-90. Figure 2-44 shows the trajectory of a ball thrown straight up in the air from near the bottom of a pit. The upward and downward parts of the trajectory actually are along the same straight line but are slightly shifted sideways in the diagram for readability. Fill in each space in the table below with +, 0, or − to indicate whether the position, velocity, and acceleration are positive, zero, or negative for the indicated parts of the trajectory.

y

v

a

While ball is going from A to B

While ball is going from B to C

When ball is at C

While ball is going from C to D

While ball is going from D to E

Figure 2-44 Problem 2-90