A railroad handcar is moving along straight, frictionless tracks with negligible
ID: 1374969 • Letter: A
Question
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 190kg and is traveling east with a velocity of magnitude 4.80m/s . Find the final velocity of the car in each case, assuming that the handcar does not leave the tracks.
Part A
An object with a mass of 28.0kg is thrown sideways out of the car with a speed of 2.50m/s relative to the car's initial velocity.
4.80
Part B
An object with a mass of 28.0kg is thrown backward out of the car with a velocity of 4.80m/srelative to the initial motion of the car.
Part C
An object with a mass of 28.0kg is thrown into the car with a velocity of 5.80m/s relative to the ground and opposite in direction to the initial velocity of the car.
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 190kg and is traveling east with a velocity of magnitude 4.80m/s . Find the final velocity of the car in each case, assuming that the handcar does not leave the tracks.
Part A
An object with a mass of 28.0kg is thrown sideways out of the car with a speed of 2.50m/s relative to the car's initial velocity.
v =4.80
m/seastPart B
An object with a mass of 28.0kg is thrown backward out of the car with a velocity of 4.80m/srelative to the initial motion of the car.
v = m/seastPart C
An object with a mass of 28.0kg is thrown into the car with a velocity of 5.80m/s relative to the ground and opposite in direction to the initial velocity of the car.
v =Explanation / Answer
by law of conservaion of momentum
mcvc=m0vo
Vc= m0V0/mc
=134.4 / 190
=0.707m/s
Vc = (28)(5.8) / 190
=0.85m/s
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