Kinematics - Sample Problems & Solutions
1. Relative Motion example:
A little girl sees an ice-cream truck 20 m ahead of her and starts running at 4.0 m/s in an effort to catch it.
The driver, not realizing that the girl is running behind the truck, accelerates away at 1.0 m/s2.
Will the child catch the truck?
Solution 1. Graphical Analysis
|d = (v)(t)-20||Time||
|V1=4.0 m/s||a = 1.0 m/s2|
|d (m)||t (s)||d(m)|
As we can see from the graph the child (purple straight line) does not meet the truck (orange curve).