# How long does it take for a car, moving with an acceleration of 2.5 m / s (2), to increase its speed from 5 to 20 m / s?

December 26, 2020 | education

| Given:

a = 2.5 m / s;

V1 = 5 m / s;

V2 = 20 m / s.

Find: delta t.

Decision:

We use this formula.

V2 = V1 + a * delta t.

Let us express the delta t from it.

Delta t = (V2-V1) / a.

Substitute the known values there and find the answer.

Delta t = (20-5) / 2.5 = 15 / 2.5 = 8 s.

Answer: delta t = 8 s.

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