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OpenStudy (kkbrookly):
Help please!
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OpenStudy (kkbrookly):
A roller-coaster car starts at a height of 90 m at Point A and is moving at a speed of 20 m/s on a later hill at Point C. Assuming friction does not affect the motion of the car, what is its height at Point C? 20 m 90 m 70 m 100 m
OpenStudy (kkbrookly):
@jack74557 can you help with this one?
OpenStudy (kkbrookly):
@Directrix @TheEdwardsFamily
OpenStudy (kkbrookly):
OpenStudy (anonymous):
use energy conservation assume potential energy at 90m as mg(90) and kinetic energy as 0 and at point C..KE to be 1/2 m V^2 + mgh equate both the equations and get h
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