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January 27, 2015

January 27, 2015

Posted by **aly** on Sunday, April 24, 2011 at 6:29pm.

point a= 30m

point b= 0m

point c= 25m

point d= 12m

1. What is the total mechanical energy of the roller coaster at point A?

2. What is the speed of the roller coaster at point B?

3. What is the potential energy and the kinetic energy of the roller coaster at point C?

4. Derive an expression for the speed of the cart using the variables E, m, g, and h.

5. Determine the speed of the roller coaster at D.

- physics -
**Damon**, Sunday, April 24, 2011 at 6:46pmreference potential energy to ground

U = m g h

Ke = (1/2) m v^2

1

E = U + Ke = 1000*9.8*30 + 500 (1.8)^2

2

E = 0 + Ke

so (1/2) m (Vat B)^2 = E from 1 above

3

same old E from part 1

E = 1000*9.8*25 + Ke at C

4

(1/2) m v^2 = E - m g h

5

(1/2) m v^2 = E - m g h

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