Select the correct answer.
How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower
potential?
A
The kinetic energy increases.
OOO
B.
C.
The kinetic energy decreases.
The kinetic energy remains the same.
D.
The kinetic energy is always zero.
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An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Anybody wanna ? (picture included? )

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?