(a) Compare the kinetic energies of two identical bodies, one moving north and the other moving south with same speed.
(b) What happens to the kinetic energy of an object if its mass in doubled while its velocity remains the same

Explanation

(a) They have the kinetic energy as `KE ( = (1)/(2) m upsilon^2)` is independent of direction of motion.
(b) Since the kinetic energy is directly proportional to mass, it is doubled.