# 03: Two-Dimensional Kinematics

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• 3.1: Motion in Two Dimensions
An object moving with constant velocity must have a constant speed in a constant direction.
• 3.2: Vectors
Vectors are geometric representations of magnitude and direction and can be expressed as arrows in two or three dimensions.
• 3.3: Projectile Motion
Projectile motion is a form of motion where an object moves in parabolic path; the path that the object follows is called its trajectory.
• 3.4: Multiple Velocities
Relative velocities can be found by adding the velocity of the observed object to the velocity of the frame of reference it was measured in.

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