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Projectile motion—Figure 3.15
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· A projectile is any body given an initial velocity that then follows a path (trajectory:轨迹 ) determined by the effects of gravity and air resistance.
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· Begin neglecting resistance.
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Equations of motion under constant acceleration |
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The trajectory is a parabola (抛物线).
Horizontal range (射程): 
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Effects of wind resistance—Figure 3.20 |
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· Cumulative effects can be large.
· Peak heights and distance fall.
· Trajectories cease to be parabolic.
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