To come up with numerical answers, numerical data must be provided.
We are physicists, not psychics.
You should have been provided with the slope of the incline and the speed at the bottom. Anyway, here is how to do this problem yourself.
Use conservation of energy to deduce the vertical drop.
The vertical drop and the slope can be used to calculate the length of the slope. (Use trigonometry)
The length of the slope and the final speed (which is twice the average speed) can be used to predict the time required.
Time req'd
= (slope length)/(average speed)
A skier is gliding along at on horizontal, frictionless snow. He suddenly starts down a incline. His speed at the bottom is .
What is the length of the incline?
How long does it take him to reach the bottom?
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