Question #5 Complete the following statement: In two-dimensional motion in the x-y plane, the x part of the motion and the y part of the motion are independent a) only if there is no acceleration in either direction. b) only if there is no acceleration in one of the directions. c) only if there is an acceleration in both directions. d) whether or not there is an acceleration in any direction. e) whenever the acceleration is in the y direction only. a = 5.0 m/s? Question #6 A roller coaster car rolls from rest down a 20° incline with an ay acceleration of 5.0 m/s2 a, How far horizontally has the coaster travelled in 10 seconds?

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.