8.1 C and 8.1 D

8.1C


The line did not go through all the dots. This tells me that the lawnmower's motion accelerates and decelerates.


8.1 D Part1



Through 0-6 seconds, there is uniform motion. From 6 - 10 seconds, there is no movement. From 10-12 seconds, there is new uniform motion. Then from 12-16 seconds, there is negative uniform motion before becoming stationary from 16-18 seconds. It then concludes with negative uniform motion once again.

The displacements are:
2mN, 0m, 4mN, 6mS, 0m, 2mS

The slopes are:
Positive, zero, positive, negative, zero, and negative

The total distance is:
16m

8.1 D Part2



(a) The object starts at the origin and travels south
with uniform motion. - 4
(b) The object starts 2 m [S] and travels north
with uniform motion. - 2
(c) The object starts at the origin and travels north
with uniform motion. - 1
(d) The object starts 2 m [N] and travels south
with uniform motion. - 3