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# 1. Acceleration is best defined as the rate of change of __________ of an object. A. position B. force C. speed D. velocity 2. Which of the following describes acceleration? A. s/m B. m/s C. m/s2 D. m2 3. Which of the following is the main difference between speed and velocity? A. Speed has direction and velocity B. Speed is measured over time C. Velocity has both speed and direction D. Speed is constant

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1. D. velocityExplanation: the Acceleration is best defined as the rate of change of the velocity of an object. In fact, the acceleration is defined as:where is the change in speed of an object, while is the time required for the change in speed to occur. Note that a change in velocity means a change in the velocity of the object, or in its direction: thus, for example, when an object moves at constant speed in a circle, it is also accelerating because its direction is changing and therefore its velocity is also changing.2. C. m/s2 the Acceleration is measured in . In fact, the acceleration is defined aswhere is measured in m/s, while that measured in s (seconds), so acceleration is measured in3. C. the Speed of the speed and direction In the reality:- the speed is a scalar quantity, so that it consists only of a magnitude, which is defined as the ratio between the distance travelled (d) and time (t): the velocity is a vector, so that it consists of both a magnitude (the speed) and a direction, which is determined by the direction of the movement.