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- In projectile motion, the object in
- motion has velocity components in both the
- x and y directions. However, the velocity in
- the x direction is independent of the velocity
- in the y direction. Therefore, the set of
- equations applying to linear motion can be
- applied to the x direction and the y direction
- in turn. Note that linear motion is just a
- special case of projectile motion where one
- of the components equals 0.
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