A 9.70-g bullet has a speed of 1.23 km/s.
(a) What is its kinetic energy in joules?
(b) What is the bullet's kinetic energy if its speed is halved?
(c) What is the bullet's kinetic energy if its speed is doubled?

Question

A 9.70-g bullet has a speed of 1.23 km/s.
(a) What is its kinetic energy in joules?
(b) What is the bullet's kinetic energy if its speed is halved?
(c) What is the bullet's kinetic energy if its speed is doubled?

anonymous · Answer

Kinetic energy = 1/2 m v^2
Be sure to change the velocity into meters/second, in order for your answer to be in joules.

anonymous · Answer

Oh, and the mass needs to be in kilograms.