A car is traveling due east at 25.0 m/s at some instant. (a) If its constant acceleration is 0.750 m/s2 due east, fi nd its velocity after 8.50 s have elapsed. (b) If its constant acceleration is 0.750 m/s2 due west, fi nd its velocity after 8.50 s have elapsed.

Chapter 1 PHYS 1220 SI Units SI units are used for equations in the course o The SI unit for time is the second (s) o The SI unit for length is the meter (m) o The SI unit for mass is the kilogram (kg) Numbers can be simplified using scientific notation Units can be converted using a conversion factor Dimensional Analysis Density ρ=(m/v) Dimensional analysis when the dimensions of a quantity instead of the value are used to solve a problem; this is often used to check a problem Dimensions can be treated as algebraic symbols for example: o V=l*w*h each is a unit of length so volume is