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Vector-valued function
r(t)=⟨f(t),g(t),h(t)⟩
Derivative of vector function
r'(t)=⟨f',g',h'⟩
Integral of vector function
Integrate each component separately.
Velocity vector
v(t)=r'(t)
Acceleration vector
a(t)=r''(t)
Speed
|v(t)|
Position from velocity
r(t)=∫v(t)dt+C
Tangent line
r=r(t₀)+r'(t₀)(t-t₀)
How to find speed
Take magnitude of velocity.
How to find acceleration
Differentiate velocity.
How to find position from acceleration
Integrate twice.
Professor trick
Speed is a scalar, velocity is a vector.
Common mistake
Confusing speed with velocity.