Question

a car is moving with a uniform velocity of 72km/h for 15 seconds on a national highway over a straight stretch of road. what is its acceleration

Answer 1

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Answer 2

Answer:

It's acceleration is zero because the velocity is constant at the given time .

Numerically , a = (v -u)/t

First we have to convert 72 km/ h in m/ s

$= 72 \times \frac{5}{18}$

= 20 m/s

therefore acceleration =

$= (20 - 20) \frac{1}{15}$

$= \frac{0}{15}$

= 0 m/s²