Inelastic Collision: Skiing on a Hill - Find Final Velocity

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Homework Help Overview

The problem involves an inelastic collision between two skiers, where one skier descends from a height and collides with a stationary skier at the bottom of a hill. The subject area includes concepts of energy conservation and momentum in physics.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the relationship between potential energy at the top of the hill and kinetic energy at the bottom, questioning the appropriate equations to use for calculating speed. Some express uncertainty about using energy methods versus kinematics.

Discussion Status

The discussion is exploring different methods to approach the problem, with some participants suggesting energy conservation principles while others consider kinematic equations. There is no explicit consensus on the preferred method, but guidance has been offered regarding the relevance of height in determining speed.

Contextual Notes

Participants are navigating the implications of the height provided in the problem and its role in calculating the skier's speed before the collision. There is mention of discomfort with energy methods, indicating varying levels of familiarity with the concepts involved.

fa08ti
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in a movie stunt, a 65 kg skier starts from a rest postion at the top of a hill 30 m high. she slides down the hill to the bottom, where she collides with a 45 kg stationary skier. the collision is completely inelastic. find the fiinal velocity of the skiers.

ATTEMPT.
i know i have to use
m1v1+ m2v2= (m1+m2)v

but I'm not sure about what values to use. and why am i given the height?
 
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The height will determine the speed of the 65 kg skier as she reaches the bottom of the hill just before colliding with the stationary skier. What equation should you use to get that speed?
 
the only equation for speed i can think of is distance/time
 
The skier at the top of the hill has potential energy which all gets turned into kinetic energy at the bottom. This is why the height of the hill is given.
 
if you are uncomfortable with energy method ... you can also do it with simple kinematics.

Tell me if you need help
 

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