The x-coordinate of a particle in curvilinear motion is given by x= 4.8t³-2.7t where x is in feet and t is in seconds. The y-component of acceleration in feet per second squared is given by ay = 2.9t. If the particle has y-components y = 0 and vy= 3.8 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 4.8 sec. Sketch the path for the first 4.8 seconds of motion, and show the velocity and acceleration vectors for t = 4.8 sec. Answers: V= a= i i ! ft/sec ft/sec²

Q: ag, a4, AB/A VB = 8.5 m/s VA =7 m/s B 50 m 50 m 40°

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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.