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(I) A constant friction force of 25 $\mathrm{N}$ acts on a 65 -kg skier for 15. S. What is the skier's change in velocity?

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Physics 101 Mechanics

Chapter 9

Linear Momentum

Motion Along a Straight Line

Kinetic Energy

Potential Energy

Energy Conservation

Moment, Impulse, and Collisions

Cornell University

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In physics, the kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body in decelerating from its current speed to a state of rest. The kinetic energy of a rotating object is the sum of the kinetic energies of the object's parts.

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the average force is given by the rate of change momentum. Delta P A riddle to tea on DSO Delta P is just mass times the raid times of change in velocity on That's divided by Delta two. Okay, so in this problem were given force and mass in time. We want adult of you so full the friction saw it will opposed will be in the opposite direction. To the direction of motion will be a negative negative. 25 Newton's That's equal to Mass, which is 65 kilograms times Delta V, which we don't know over Delta T, which is 15 seconds. Therefore, Delta V is just 25 times 15 over 65. This will be in meters per second and we get, um, are negative 25 times now and we get minus 5.8 meters per second. Therefore velocity was 5.8 meters per second. Was a velocity lost

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