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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 200 $\mathrm{kg}$ and is traveling east with a velocity of magnitude 5.00 $\mathrm{m} / \mathrm{s} .$ Find the final velocity of the car in each case, assuming that the handcar does not leave the tracks. (a) A $25.0-\mathrm{kg}$ mass is thrown sideways out of the car with a velocity of magnitude 2.00 $\mathrm{m} / \mathrm{s}$ relative to the car's initial velocity. $(b) A 25.0-k g$ mass is thrown backward out of the car with a velocity of 5.00 $\mathrm{m} / \mathrm{s}$ relative to the initial motion of the car. (c) A 25.0 $\mathrm{kg}$ mass is thrown into the car with a velocity of 6.00 $\mathrm{m} / \mathrm{s}$ relative to the ground and opposite in direction to the initial velocity of the car.

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(a) $v_{2}=5 \mathrm{m} / \mathrm{s}$(b) $v_{2}=5.714 \mathrm{m} / \mathrm{s}$(c) $v=3.78 \mathrm{m} / \mathrm{s}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Cornell University

Hope College

University of Winnipeg

McMaster University

Lectures

04:30

In classical mechanics, impulse is the integral of a force, F, over the time interval, t, for which it acts. In the case of a constant force, the resulting change in momentum is equal to the force itself, and the impulse is the change in momentum divided by the time during which the force acts. Impulse applied to an object produces an equivalent force to that of the object's mass multiplied by its velocity. In an inertial reference frame, an object that has no net force on it will continue at a constant velocity forever. In classical mechanics, the change in an object's motion, due to a force applied, is called its acceleration. The SI unit of measure for impulse is the newton second.

03:30

In physics, impulse is the integral of a force, F, over the time interval, t, for which it acts. Given a force, F, applied for a time, t, the resulting change in momentum, p, is equal to the impulse, I. Impulse applied to a mass, m, is also equal to the change in the object's kinetic energy, T, as a result of the force acting on it.

03:36

A railroad handcar is movi…

05:15

23:14

0:00

03:56

A roller-coaster car of ma…

06:05

The "flying car"…

Four railroad cars, each o…

09:02

A $2000-\mathrm{kg}$ autom…

03:37

A car and train move toget…

04:07

09:18

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01:59

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