- #1

Like Tony Stark

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- Homework Statement
- Let' suppose that a problem says "a car has a velocity of ##5 m/s## and an acceleration such that it stops some seconds later". And I want to solve for the acceleration so I can replace it in another equation.

- Relevant Equations
- ##V_f =v_0 +a.t##

What should I do? Because I have two possibilities. I have ##0=5+at## so ##-5/t =a##. But then I can also say that the acceleration is a negative because it is stopping, so I can write it like ##0=5-kt## and then ##5/t =k##