C
cutiepie291404
Guest
A roller-coaster car with a mass of 550 kg starts at rest from a point 38 m above the ground. At point B, it is 19 m above the ground.
(a) What is the initial potential energy of the car? ___kj
(b) What is the potential energy at point B? ___kj
(c) If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 18 000 J, what is the kinetic energy of the car at point B? ____kj
(a) What is the initial potential energy of the car? ___kj
(b) What is the potential energy at point B? ___kj
(c) If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 18 000 J, what is the kinetic energy of the car at point B? ____kj