I keep getting “Equations of motion” questions wrong in Kinematics. What's the trap?
using them when acceleration is changing.
The usual trap: using them when acceleration is changing. How to avoid it: if a is not constant, you must use calculus, not these three equations. Go back to the definition — the v=u+at family that connects u, v, a, s and t — valid only for constant acceleration.
Key point
Equations of motion
Common mistake
using them when acceleration is changing.
Memory tip
if a is not constant, you must use calculus, not these three equations.
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