Question

a car starts from rest and attains a velocity of 18 km/h in 2 sec find it accerleration in S.I unit

Answer 1

Answer on Question #43423 – Physics – Acoustics

Question.

A car starts from rest and attains a velocity of $18\,\mathrm{km/h}$ in 2 sec find it acceleration in S.I unit.

$$v = 18 \frac{\mathrm{km}}{\mathrm{h}} = 5 \frac{\mathrm{m}}{\mathrm{s}}$$

$v_0 = 0$ is the velocity of rest position

$$t = 2\,\mathrm{s}$$ $$a = ?$$

Solution.

By definition:

$$a = \frac{dv}{dt} = \frac{v - v_0}{t}$$

Calculate:

$$a = \frac{5}{2} = 2.5 \frac{\mathrm{m}}{\mathrm{s}^2}$$

Answer.

$$a = \frac{v - v_0}{t} = 2.5 \frac{\mathrm{m}}{\mathrm{s}^2}$$

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