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mybrohshi5
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Homework Statement
A railroad handcar is moving along straight, frictionless tracks with negligible air resistance. In the following cases, the car initially has a total mass (car and contents) of 160 kg and is traveling east with a velocity of magnitude 4.70 m/s. Find the final velocity of the car in each case, assuming that the handcar does not leave the tracks.
An object with a mass of 28.0 kg is thrown backward out of the car with a velocity of 4.70 m/s relative to the initial motion of the car.
Homework Equations
p=mv
The Attempt at a Solution
the momentum of the system is
p = (160+28)(4.7) = 883.6
so
883.6 = 160(vf) + 28(-4.7+4.7)
883.6 = 160vf
vf = 5.52 m/s
Where did i got wrong? :(
Thank you for any help