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# HELP ME WITH THIS!!!

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A roller coaster car with a mass of 5,178 kg is at the top of a incline that is 26 m high. Calculate the amount of kinetic energy the car has when it reaches the bottom of the hill. Assume there is no friction.

physics
TOK002  Feb 21, 2015

### Best Answer

#1
+5

If there is no friction then the loss of potential energy as the roller coaster falls will equal the gain in kinetic energy of the roller coaster car.

so kinetic energy gained = m x g x h

therefore KE = 5178 x 10 x 26 Joules assuming the acceleration due to gravity g = 10 m/s2

Therefore KE gained = 1,346,280 Joules or 1.35 MJ

Guest Feb 21, 2015
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### 2+0 Answers

#1
+5
Best Answer

If there is no friction then the loss of potential energy as the roller coaster falls will equal the gain in kinetic energy of the roller coaster car.

so kinetic energy gained = m x g x h

therefore KE = 5178 x 10 x 26 Joules assuming the acceleration due to gravity g = 10 m/s2

Therefore KE gained = 1,346,280 Joules or 1.35 MJ

Guest Feb 21, 2015
#2
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Thanks TOK002 and anon.

I like it when people provide questions and answers in physics that are basic enough and clear enough for me to learn from.

Melody  Feb 22, 2015

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