A freight train car with a mass of 1.2 × 104 kilograms, travelling with a velocity of 23 meters/second, collides with a stationary freight train car of equal mass. What is the momentum of the system after the collision?
Select one of the options below as your answer:
A. 1.2 × 105 kilogram meters/second
B. 1.4 × 105 kilogram meters/second
C. 2.4 × 104 kilogram meters/second
D. 2.8 × 105 kilogram meters/second

please help -.-

Question

A freight train car with a mass of 1.2 × 104 kilograms, travelling with a velocity of 23 meters/second, collides with a stationary freight train car of equal mass. What is the momentum of the system after the collision?
Select one of the options below as your answer:
A. 1.2 × 105 kilogram meters/second
B. 1.4 × 105 kilogram meters/second
C. 2.4 × 104 kilogram meters/second
D. 2.8 × 105 kilogram meters/second

please help -.-

anonymous · Answer

d