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・ Prokaryotic elongation factors
・ Prokaryotic initiation factor
・ Prokaryotic initiation factor-1
・ Prokaryotic initiation factor-2
・ Prokaryotic initiation factor-3
・ Prokaryotic initiation factors
・ Prokaryotic phospholipase A2
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Projectile motion
・ Projectile point
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・ Projection (linear algebra)
・ Projection (mathematics)
・ Projection (relational algebra)
・ Projection (set theory)
・ Projection areas
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・ Projection bias
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Projectile motion : ウィキペディア英語版
Projectile motion

Projectile motion is a form of motion in which an object or particle (called a projectile) is thrown near the earth's surface, and ''it moves along a curved path under the action of gravity only.'' The only force of significance that acts on the object is gravity, which acts downward to cause a downward acceleration. There are no horizontal forces needed to maintain the horizontal motion – consistent with the concept of inertia.
== The initial velocity ==
If the projectile is launched with an initial velocity \mathbf_0 , then it can be written as
: \mathbf_0 = v_\mathbf + v_\mathbf.
The components v_ and v_ can be found if the angle, \theta is known:
: v_ = v_0\cos\theta,
: v_ = v_0\sin\theta.
If the projectile's range, launch angle, and drop height are known, launch velocity can be found using Newton's formula
: V_0 = \sqrt .
The launch angle is usually expressed by the symbol theta, but often the symbol alpha is used.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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