A 1100kg rollercoaster car is pulled up to the top of a track which is 19 meters above the ground

A. How much gravitational potential energy does the car gain when it is pulled from the ground to the top of the track?

B. The same car is left to roll down the track, and rolls down into a dip which is 5 meters above the ground. Assuming negligible friction and air resistance, what is the kinetic energy of the car at the bottom of the dip?

C. What is the speed of the car at the bottom of the dip?

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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