. The president's airplane, Air Force One, flies at 250 m/s to the east with respect to the air. The air is moving at 35 m/s to the north with respect to the ground. Find the velocity of Air Force One with respect to the ground. 252 m/s c. 222 m/s b. 435 m/s d. 125 m/s 2.A motorboat, which has a speed of 5 meters per second in still water, is headed east as it crosses a river flowing south at 3.3 meters per second. What is the magnitude of the boat's resultant velocity with respect to the starting point? C. 5 m/s b. 6 m/s d. 8.3 m/s a. 3.3 m/s 3. A person observes a fireworks display from a safe distance of 0.750 kilometer. Assuming that sound travels at 340 meters per second in air, what is the time between the person seeing and hearing a fireworks explosion? a. 0.453 S c. 2.21 s b..410 s d. 255,000 S 4. A child walks 5 meters north, then 4 meters east, and finally 2 meters south. What is the magnitude of the resultant displacement of the child after the entire walk? a. 1 m c. 5 m b. 3 m d. 11 m 5.An object is shot from the ground (at 25 m/s) at 25 degrees and 65 degrees. Which one has the greater range? (assume no air resistance) a. 25 degrees c. 65 degrees b. Same for both d. none of the above

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Centripetal Force

A particle, body, object or certain mass while travelling in a rotational path or semicircular path, experiences an inertia force. If that inertia force pulls the towards the inward of the imaginary circle in the rotation, it is termed as centripetal force.