Note the Physics

• The X vs. t graph is a straight line parallel to the time axis, which indicates that the x-component of the velocity (V_x) is constant.
• The approximate value for V_x can be found from the slope of the X vs. t line -- about 25 m/s.
• The fact that the X vs. t graph is a straight line, and thus that V_x is constant, means that the x-component of the acceleration is zero.
• The Y vs. t graph is curved, with steadily decreasing slope, which indicates that the y-component of the velocity (V_y) is decreasing, and in fact changes from positive (upward) to negative (downward).
• The y-component of the velocity (but not the total velocity) is zero at the maximum height.
• The fact that the Y vs. t graph is everywhere concave downward, or the V_y vs. t curve has negative slope, means that the y-component of the acceleration is everywhere negative (downward) in this motion.