How do you find potential and kinetic energy? I've gotten these questions wrong on my test and I do not understand why.
a 3-kg object is thrown horizontally off a 12-m high cliff. The Kinetic energy of the object just before it hits the ground is 500 J. ignore air resistance.
a) what is the potential energy of the object just after it is thrown? Set gravitational potential energy equal to zero when the object hits the ground
my answer:kinetic energy just before the object hits the ground is 500 J, which means that potential energy would be 500 J right after it is thrown
b) What is the kinetic energy of the object just after it is thrown?
my answer: kinetic energy would be 0 J because the kinetic energy was 500 J just before it hit the ground