1. A swimmer exerts a force on a boat and the boat exerts a reaction force on the swimmer this is an example of Newton's.
A. First law
B. Second law
C. Third law
2. A girl runs twice around a circular track 25 m in radius. At the end of the run, her displacement from her original position is
A. 25 m
B. 157 m
C. 314 m
D. 0 m
3. The base SI unit of mass is ?
A. milligram
B. gram
C. kilogram
D. slug
E. newton