Friday
October 24, 2014

Homework Help: physics

Posted by Vishnu on Wednesday, October 8, 2008 at 12:47am.

A skier is gliding along at 1.13 m/s on horizontal, frictionless snow. He suddenly starts down a 13.1 incline. His speed at the bottom is 18.8 m/s. What is the length of the incline?

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Use his change in kinetic energy to get his loss of potential energy. The equation
g H = change in (V^2)/2
can be used to het the height change, H.

H and the slope angle can be used to get the length L of the incline.

H/L = sin 13.1

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My attempt:

H/L = sin 13.1

L = sin13.1 / H
= sin13.1 / 18.8 m/s
= 0.01 km = 10 m

Why is this answer incorrect?

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