Choosing kinematic equations (video) | Khan Academy Kinematic equations help solve for an unknown in a problem when an object has either a constant velocity or constant acceleration This video will help you choose which kinematic equations you should use, given the type of problem you're working through
Kinematics | AP®︎ College Physics 1 | Science | Khan Academy Describe and analyze projectile motion in two dimensions using mathematical models and graphs Predict how a projectile's velocity and acceleration components change throughout its trajectory, and solve projectile motion problems using the kinematic equations
Free fall (article) | Kinematics | Khan Academy Although it doesn't necessarily answer your question directly, you could find an equation to model a specific feather falling by taking measurements of the distance that a feather falls with respect to time
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