Which of the Following Have the Highest Ratio of Kinetic

Multiple Choice

Which of the following have the highest ratio of kinetic energy to momentum,K/p?

A) an asteroid with mass 10⁶ kg and speed 500 m/s
B) a high-speed train with a mass of 180,000 kg and a speed of 300 km/hr
C) a 120-kg linebacker with a speed of 10 m/s
D) a 10-kg cannon with a speed of 120 m/s
E) a proton with a mass of 6 * 10^-27 kg and a speed of 2 * 10⁵ m/s