![]() ![]() ![]() Object 3 has been shown to be operating only under the influence of gravity, producing a change in velocity of –49 m/s every 5 seconds for the entire period, including the one asked about here. Object 1 has an upward (positive) change in velocity of 51 m/s every 5 seconds for the period being looked at. Which of the three objects may be traveling solely under the influence of gravity for the entire period shown?Ĭonstant acceleration means that the change in velocity for the period specified from second 5 to second 25 must always be the same. Positive velocities indicate motion upward, and negative velocities indicate motion downward.įigure 1 is a graphical representation of the velocity of each object at every point during the 45 seconds under review.ġ. Table 1 indicates the vertical velocities of the three different objects as measured every 5 seconds. Where other forces have been applied, they always begin and end at one of the 5-second intervals. They each may also be influenced by other vertical forces for all or part of that period. Each of the objects is operating under the influence of gravity for the entire 45 seconds being studied. Table 1 and Figure 1 provide information about the vertical velocities measured for three different objects without regard to the horizontal motion of the objects. ![]() These other forces, acting in combination with gravity, can cause a net force greater than or less than gravity, and, therefore, a net acceleration different from the downward acceleration of 9.8 m/s 2 caused by gravity. Other forces, including those produced by wind and aerodynamic lift, as well as jet, rocket, internal combustion or other engines may also exert upward or downward forces on these objects. The earth’s gravitational force produces a downward acceleration of 9.8 m/s 2 on all objects near the earth’s surface. ACT Science Passage I-Data Representation ![]()
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