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How do you solve the word problem with the equation V₍f₎²= V₍i₎²+2aΔx, step by step?

An object at rest starts accelerating. If it travels 40 meters to end up going 20m/s, what was its acceleration?

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Respuesta :

LammettHash

Starting from rest means the initial speed is 0. The object attains a speed of 20 m/s over a distance of 40 m, so its acceleration is a such that

(20 m/s)² = 0 + 2a (40 m)

Solve for a :

a = (20 m/s)² / (2 (40 m)) = 5 m/s²

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