Which of the following statements is correct? A body that moves along a straight line must be moving at constant velocity. A body that moves along a straight line must be moving at constant speed. A body that moves along a curve line must be moving at constant velocity. A body that moves along a curve line must be moving at constant speed   3. Which of the following indicates the motion of a body? A change in time in a region of space. A change in position in a region of space. A change in mass in a frame of reference. A change in dimension in a frame of reference.   4. If the acceleration of the body is increasing linearly, which of the following statements is true?   a. The acceleration of the body is remains the same through time. b. The acceleration of the body can be expressed in a quadratic form c. The average acceleration of the body is equal to the instantaneous acceleration. d. The change in velocity of the body can be expressed in quadratic form.

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Projectile Motion