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February 1, 2015

February 1, 2015

Posted by **Help!** on Tuesday, December 18, 2012 at 7:00pm.

First timing: 0.42 seconds

Second timing: 0.41 seconds

Third timing: 0.46 seconds

You also determine that the track makes a 27 degree angle with the ground on the section where the train is being towed up to the top of the first hill.

With all of this information you should now be able to answer the following questions.

1) What is the speed of the train at the bottom of the first hill?

2) If you were riding on the train, how much kinetic energy would you have at the bottom of the first hill?

3) How much potential energy did you have at the top of the first hill?

4) How much energy was lost due to friction as you came down to the bottom of the first hill?

5) Finally, what is the minimum force that must have been exerted on you to pull you up to the top of the first hill?

Please help me. im soo confused!

- Physics -
**Help!**, Tuesday, December 18, 2012 at 11:00pm*update

i found the speed. it was 23.5 m/s

so with this i could find #1,2 and 3.

But I still need help with #4 and 5!

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