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?

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 1

Answer: Option (D) is the correct answer.

Step-by-step explanation:

Momentum is defined as the ability or tendency of an atom to continue moving.

The relation between momentum, velocity and mass is as follows.

p = m × v

where, p = momentum

m = mass

v = velocity

It is given that mass is
`1.2 * 10^(4) kg` and velocity is 23 m/s. Therefore, calculate momentum as follows.

p = m × v

=
`1.2 * 10^(4) kg * 23 m/s`

=
`27.6 * 10^(4) kg m/s`

=
`2.8 * 10^(5) kg m/s`

Thus, we can conclude that momentum of the system after the collision is
`2.8 * 10^(5) kg m/s`.

Answer 2

To answer this question , we can use this formula :

momentum = mass x velocity

1.2 x 10^4 x 23

= D. 2.8 x 105 kilogram meters/second

hope this helps