28.5 Exercise 1

In Relativistic Energy, the relationship of relativistic momentum to energy is explored. That subject will produce our first inkling that objects without mass may also have momentum.

What is the momentum of an electron traveling at a speed $0 . \text{985} c$? The rest mass of the electron is $9 . \text{11} \times \text{10}^{- \text{31}} \text{ kg}$.