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?

Answer 1

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

Answer 2

momentum = mass * velocity

stationary object has no velcity , so no momentum.

only consider moving one

Answer 3

1.2 × 104 kilograms * 23 meters/second

Answer 4

so my answer would be D

Answer 5

1.2*10^4 * 23=276000

Answer 6

which is closed to D

Answer 7

oh okay, thank you!

Answer 8

2.8*10^5=280,000

Answer 9

that's it, done with hw?

Answer 10

nope not yet