Question

A car starting from rest acquires a velocity of 54 kmh to the power -1 in 20 seconds. what is its acceleration

Answer 1

STEP BY STEP EXPLANATION

Here,

Initial velocity, u= 0

(As the car is starting from rest)

Final Velocity

$= 54 \: km {h}^{ - 1} = 54 \times \frac{5}{18} = 3 \times 5 = 15 \: m {s}^{ - 1}$

Time take, t= 20 s

acceleration, a

$a = \frac{v - u}{t} = \frac{15 - 0}{20} = \frac{15}{20} = 0.75 \: m {s}^{-2}$

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