Soru
A plot of an object's velocity vas a function of time is a straight line with a positive slope and crosses the r-axis at some time Which of the following statements is not true? A.The object changes its direction of motion at some instant B. The average acceleration of the object between any two time points is equal to its instantaneous acceleration C. Theacecleration of the object is constant D. The objectine ct changes its direction of motion E. The object is instantancously at red at some instant
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Elit · 8 yıl öğretmeni
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Cevap
The correct answer is E. The object is instantaneously at rest at some instant.Explanation:A plot of an object's velocity as a function of time being a straight line with a positive slope indicates that the object is undergoing constant acceleration. Let's analyze each statement:A. The object changes its direction of motion at some instant - This statement is true. When an object undergoes constant acceleration, it means that its velocity is changing, which can result in a change of direction.B. The average acceleration of the object between any two time points is equal to its instantaneous acceleration - This statement is true. With constant acceleration, the average acceleration over any time interval is equal to the instantaneous acceleration at any given point in time.C. The acceleration of the object is constant - This statement is true. The given information directly states that the object is undergoing constant acceleration.D. The object changes its direction of motion - This statement is true. As mentioned in statement A, constant acceleration implies a change in velocity, which can lead to a change in direction.E. The object is instantaneously at rest at some instant - This statement is not true. If the velocity is always increasing (as indicated by the positive slope), the object will never be at rest.