(WORK AND ENERGY) URGENT PHYSICS QUESTION?
a hot wheel car with a mass of m is released from rest at the top of the track in a living room. the initial height of the car is h. Construct a function that will you what the car's speed will be when the car reaches 2/5h , involving only the variable h and the constant g. Thank you!
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answers:
Andrew Smith say: Kinetic energy gained = potential energy lost.
1/2 m v^2 = mg ( h - 2/5 h)
= mg 3h/5
divide bs by m
1/2 v^2 = 3 gh / 5
v^2 = 6 gh / 5
v = sqrt( 6 gh/5)
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