Physics 105

Chapter 1: Introduction, Measurement & Estimating

1) You run a race with a friend. At first your kinetic energy is the same as his kinetic energy, but he is running faster than you are. When you increase your speed by 20 percent, you are running at the same speed he is. If your mass is 85 kg what is his mass (in kg)?

3) What are the SI units of power?

4) Which of the following can be used as a conversion factor to write m/s as mi/h? (1mi = 1609m)

5) The position of a car is given by the equation X= A + B t^2.
The dimensions of the constants A and B respectively are?