4. An object moving along a straight line is decelerating. Which one of the foll

Question

4. An object moving along a straight line is decelerating. Which one of the following statements oncerning the object's acceleration is necessarily true? The value of the acceleration is positive. Cad). The direction of the acceleration is in the direction opposite to that of the velocity (De) The direction of the acceleration is in the same direction as the displacement ce An object that is decelerating has a negative acceleration (ae) The acceleration changes as the object moves along the line. 5. If A B, then what is the angle between A & B? (bd 0 (ab) 90 (ce) 180° (be) 270° (ac) 360° 6. A car has traveled completely around a circular track of radius, r 240 m, what is the magnitude of its displacement? (de) r (be) 2r (ae) r (bd) 2tr (ab) zero meters Hartley Exam #1

Explanation / Answer

4)Correct Answer is:

(ce)An object that is decelerating has negative acceleration.

Because- deceleration implies negative negative acceleration, an object delecerate while it stops.

5) (bd)0 deg

then angle between them is 0 deg

both the vectors will have same coodinates of the points on axes, so the angle between them will be zero.

6)The displacement will be

(ab)zero

Because the car is in the circular path and return to the same point after completion, hence the displacement is zero/

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