A 50kg roller coaster cart is pulled to the top of a 20m tall hill. How fast is it going at the bottom of the hill? What is its potential, kinetic and total ene

Question

Does anyone know the answer to this question? I really need this as soon a possible

Answer 1

At top:

 

U = mgh = (50)(9.8)(20) J = 9800 J

K = 0

E = U + K = 9800 J

 

At bottom:

 

U = 0

K = 9800 J

E = 9800 J

 

K = (1/2)mv² ⇒ v = √(2K/m) = √[2(9800)/50] m/s ≅ 19.8 m/s