Math  /  Math Statement

QuestionA car takes 4 s to stop over 20 m. Can we find its speed before braking without knowing acceleration? Options: (A) Yes, 20 m/4 s20 \mathrm{~m} / 4 \mathrm{~s}. (B) Yes, double average speed. (C) No, need acceleration for Δx=v0t+12at2\Delta x=v_{0} t+\frac{1}{2} a t^{2}. (D) No, velocity definition includes acceleration.

Studdy Solution
From this equation, we can see that in order to find the initial speed uu, we need to know the acceleration aa. Therefore, the speed of the car immediately before the brakes were applied cannot be determined without first determining the car's acceleration.
The answer is (C) No, because the acceleration is needed to use standard equations such as Δx=v0t+12at2\Delta x=v_{0} t+\frac{1}{2} a t^{2}.

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