A particle moves along the x-axis with an initial velocity v=50 ft/s at the origin when t=0. For the first 4s it has no acceleration, and thereafter it is acted on by a retarding force which gives it a constant acceleration a= -10 ft/s². a. Calculate the velocity and the x-coordinate of the particle for the conditions of t= 8s and t= 12s? b. Find the maximum positive x-coordinate reached by the particle. c. Plot the graph of velocity vs. time, and position vs. time.

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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.