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If the magnitude of the acceleration is 5 m/s2, then you must conclude that the velocity changes exactly by 5 m/s.
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A particle moves so that its velocity (ms-') at time t seconds is given by the formula v = e2sin 31 cos3t. a Find: i an expression for the acceleration of the particle ii the time t at which the particle's acceleration is first equal to -0.5 ms-2. b Find an expression for the displacement of the particle (s) from its initial position at time t. c Write down the exact value of the maximum displacement of the particle.
Two students perform an experiment with a train and a ball. Michelles rides on a fltcar pulled at 7.85 m/s by a train on a straight, horizontal track; Gary stands at rest on the ground near the tracks. When michelle throws the ball with an initial angle of 57° above horizontal, from her point of view, Gary sees the ball rise straight up and back down above a fixed point on the ground. A. Did michelle throw the ball toward the front of the train or toward the rear of the train? Explain b. What was the initial speed of Michelle’s throw? c. What was the initial speed of the ball as seen by Gary?
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QUESTION 15 If the velocity of an object is zero at some point, then its acceleration must also be zero at that point. O True O False QUESTION 16 Suppose that an object travels from one point in space to another. Make a comparison between the magnitude of the displacement and the distance traveled by this object O A. The magnitude of the displacement can be either greater than, smaller than, or equal to the distance traveled. O B. The magnitude of the displacement is either less than or equal to the distance traveled OC The magnitude of the displacement is always equal to the distance traveled. O D. The magnitude of the displacement is either greater than or equal to the distance traveled. QUESTION 17 Shown below are the velocity and acceleration vectors for an object in several different types of motion. In which case is the object slowing down and turning to its ri OA. ick Save and Submit to save and submit. Click Save All Answers to save all answers. Type here to search