Posted by **Joey** on Thursday, November 4, 2010 at 5:48pm.

If I have a roller coaster, and hill 1 height is 50cm and hill height 2 is 25 cm and the PE is .9 as it approaches the top of hill 2, how do I calculate the speed.

Please help

- Physics-Please help -
**bobpursley**, Thursday, November 4, 2010 at 5:52pm
THe PE is .9 where? Where did the coaster start?

- Physics-Please help -
**Joey**, Thursday, November 4, 2010 at 5:54pm
The coaster started at .18PE-the .9 is the PE at the top of the second hill.The second hill is lower.

- Physics-Please help -
**bobpursley**, Thursday, November 4, 2010 at 6:01pm
Well, the difference in the two Potential energies is now KEnergy, 1/2 mv^2, solve for v.

- Physics-Please check -
**Joey**, Thursday, November 4, 2010 at 6:21pm
. The way to calculate this is you take the KE would be .9. You would say .9 = ½ (.035 x v^2) = 2.215. Correct or no?

- Physics-Please check -
**Joey**, Thursday, November 4, 2010 at 7:31pm
Should I have done this as 1/2mv^2 = mgh

Cross out like terms and get to v^2 = square root of 2 x g x .25m(h)= 2.125 m/s

Would this be correct?

## Answer this Question

## Related Questions

- Physics-bobpursley please check - This is the question I posted about two hours ...
- Physics-bobpursleyplease check - This is the question I posted about two hours ...
- PHYSICS - An 800.0 kg roller coaster car is at rest at the top of a 95 m hill. ...
- physics - 4. An 800.0 kg roller coaster car is at rest at the top of a 95 m hill...
- physics - If the roller coaster track has a hill at the end that was equal in ...
- Physics - A roller coaster has a mass of 425 kg. It sits at the top of a hill ...
- Physics - Another question :) At the top of its drop hill, a 1,000 kg roller ...
- Algebra - The velocity v of a roller coaster in feet per second at the bottom of...
- Physics - At the beginning of a roller coaster ride, the car is lifted to the ...
- Physics - You are at the park. You are going to analyze a roller coaster. You ...

More Related Questions