Instructions: Look at the motion graphs shown below. Match the descriptions here to the coorect graph. Description a. A car moving at a constant speed stops and then moves in the opposite dorection at the same speed.
Description b. A car moving at a constant speed stops and then moves faster in the same diresction.
Description c. A car moving at a constant speed changes to a higher constant speed
Description d. A car moving at a constant speed changes to a lower constant speed.

A-2

B-4

C-1

D-3

Explanation:

In description A, the car is first moving at a constant speed, which means it will have a constant slope. Then, it stops, which causes a slope of 0. Finally, it moves in the opposite direction, which will cause a negative slope. The second graph has a positive, zero, and negative slope; therefore, it fits A.

Description B has a constant slope, a zero slope, and a higher slope. Graph 4 goes up normally, then stops, and finally goes steeper. This fits description B.

Description C has a constant and then a higher slope. Graph 1, increases steadily and then sharply increases; which fits C.

Description D has a constant and then a lower slope. Graph 3 increases fast but then flattens, which matches the slopes in the description.