1) The slope of a line connecting two points on a position versus time graph gives A) displacement. B) instantaneous velocity. C) average velocity. D) instantaneous acceleration. E) average acceleration. 2) The slope of a tangent line at a given time value on a position versus time graph gives A) displacement. B) instantaneous velocity. C) average velocity. D) instantaneous acceleration. E) average acceleration 3) If the position versus time graph of an object is a horizontal line, the object is A) moving with constant non-zero speed. B) moving with constant non-zero acceleration. C) at rest. D) moving with infinite speed. E) none of the above 4) If the position versus time graph of an object is a vertical line, the object is A) moving with constant non-zero speed. B) moving with constant non-zero acceleration. C) at rest. D) moving with infinite speed. E) none of the above 5) When is the average velocity of an object equal to the instantaneous velocity? A) always B) never C) only when the velocity is constant D) only when the velocity is increasing at a constant rate E) only when the velocity is decreasing at a constant rate