posted by .

This is the question I posted about two hours ago and I worked it out two ways-could you scroll down and check it, please?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.

THe PE is .9 where? Where did the coaster start?

The coaster started at .18PE-the .9 is the PE at the top of the second hill.The second hill is lower.

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?

## Similar Questions

I don't understand this question, so if anyone can answer it, that would be great! We are doing motion problems, so as you probably know, the formula is d=rt. (distance equals rate times time.) We have to make a chart to answer the …

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

This is the question I posted about two hours ago and I worked it out two ways-could you scroll down and check it, please?
4. ### physics

4. An 800.0 kg roller coaster car is at rest at the top of a 95 m hill. It rolls down the first drop to a height of 31 m. When it travels to the top of the second hill, it is moving at 28 m/s. It then rolls down the second hill until …
5. ### Algebra

The velocity v of a roller coaster in feet per second at the bottom of a hill is Where h is the height of the hill in feet. Simplify the equation. Determine the velocity of a roller coaster at the bottom of a 134-foot hill.
6. ### phycis

A roller coaster has two hills and starts from rest atop the first hill , which is the higher of the two hills . The secound hill increases if the height of the initial hill is increased by 20m
7. ### physics

If the roller coaster track has a hill at the end that was equal in height to the original hill, would the marble make it all the way to the top?
8. ### PHYSICS

An 800.0 kg roller coaster car is at rest at the top of a 95 m hill. It rolls down the first drop to a height of 31 m. When it travels to the top of the second hill, it is moving at 28 m/s. It then rolls down the second hill until …
9. ### Physics

At the beginning of a roller coaster ride, the car is lifted to the top of a large hill and released. The speed of the car at the top of the hill is small, so we will assume it to be zero. The car rolls freely down this hill and reaches …
10. ### Algebra

I NEED HELP A\$AP, PLEASE! I don't understand how to do this :( I have to draw a short roller coaster on graph paper Directions: 1. Draw the side view of your roller coaster on graph paper. For the sake of simplicity, assume that your …

More Similar Questions