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 170 kg and is traveling east with a velocity of magnitude 5.30 m/s. Find the final velocity of the car in each case, assuming that the handcar does not leave the tracks. (A)An object with a mass of 25.0 kg is thrown sideways out of the car with a speed of 2.50 m/s relative to the car's initial velocity. (B)An object with a mass of 25.0 kg is thrown backward out of the car with a velocity of 5.30 m/s relative to the initial motion of the car. (C)An object with a mass of 25.0 kg is thrown into the car with a velocity of 6.00 m/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 170 kg and is traveling east with a velocity of magnitude 5.30 m/s. Find the final velocity of the car in each case, assuming that the handcar does not leave the tracks.
(A)An object with a mass of 25.0 kg is thrown sideways out of the car with a speed of 2.50 m/s relative to the car's initial velocity.
(B)An object with a mass of 25.0 kg is thrown backward out of the car with a velocity of 5.30 m/s relative to the initial motion of the car.
(C)An object with a mass of 25.0 kg is thrown into the car with a velocity of 6.00 m/s relative to the ground and opposite in direction to the initial velocity of the car.
Conservation of momentum:
m1 v1 =m1v2
1705.30=170v2
v2 =5.30 m/s
thus remains same speed as body is thrown sideways.
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