Momentum problem (should be pretty easy I think)

Homework Statement

A 20 metric ton train moves toward the south at 50 m/s. What speed must it travel to have two times its original momentum?

Homework Equations

Change in momentum = mass(FinalVelocity - InitialVelocity)

The Attempt at a Solution

so I thought you would simply times 50 by 2 and get 100 to be the answer, but thats not right. First question is do you have to convert 20 metric tons to kilograms?

PhanthomJay
Homework Helper
Gold Member

Homework Statement

A 20 metric ton train moves toward the south at 50 m/s. What speed must it travel to have two times its original momentum?

Homework Equations

Change in momentum = mass(FinalVelocity - InitialVelocity)

The Attempt at a Solution

so I thought you would simply times 50 by 2 and get 100 to be the answer, but thats not right. First question is do you have to convert 20 metric tons to kilograms?
did you put in the units for its speed?

you mean 50 m/s yeah?...if thats not what you mean then I'm confused

PhanthomJay