if the first hill of a roller coaster is 80 m tall, what is the total energy of the car if its mass is 200kg

Question

i dont know how to do this. help me. its 9th grade physical science and i need to find total energy but i dont have the PE or KE but i know how to slove the PE but not KE because i need the velocity  

Answer 1

If you knew the velocity v, then

 

KE = mv²/2

 

PE = mgh

 

Total E = KE + PE

 

There is not enough information given in this problem statement to find the velocity, so we cannot find KE.  Please double-check the original problem and see if there is more information.