Posted by **Christina** on Monday, June 6, 2011 at 6:23pm.

A stationary roller coaster at the top of its path is 30m about the ground. The car and its passengers have a mass of 400kg. What is the velocity of the car when it reaches the ground lever? The formula for velocity is (Distance/time)

- Science -
**bobpursley**, Monday, June 6, 2011 at 6:45pm
the gain in Kinetic energy is equal to the loss of potential energy

1/2 m v^2=mgh

solve for v

- Science -
**Damon**, Monday, June 6, 2011 at 6:45pm
mass cancels out, irrelevant

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

2 g h = v^2

v = sqrt (2 g h)

v = sqrt (2*9.8*30)

v = 24.2 m/s

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