Question

A car travelling at 20m/sec speeds up to 60m/sec in 6 sec. What is its acceleration?

Answer 1

Explanation:

u= 20 m/s

v= 60 m/s

t = 6 sec

a = (v-u)/t = (60-20) /6 = 40/6 =6.7m/s^2

Answer 2

Applying newton's first equation of motion,

v= u+at

$= > 60 = 20 + a \times 6 \\ = > 40 = 6a \\ = > a = \frac{40}{6} = 6.66 \: m {s}^{ - 2}$

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