2.9. Visualize: Please refer to Figure EX2.9.
Solve: (a) The acceleration of the train at t = 3.0 s is the slope of the v vs t graph at t = 3 s. Thus
a = ( 2 m/s ( 2 m/s) ) (8 s ) = 0.5 m/s 2 .
(b)
2.15.
Model:
Visualize:
Solve:
Represent the spherical dr
1.12.
(a)
Solve:
(b)
1.18. Solve:
(a)
Dot
1
2
3
4
5
6
7
8
9
Time (s)
0
2
4
6
8
10
12
14
16
x (m)
0
30
95
215
400
510
600
670
720
(b)
Visualize: The bicycle is moving with an acceleration of 1.5 m/s2. Thus, the velocity will increase by
1.5 m/s each second