Question

The veleocity of bus incrases from 72 km/h to 30m/s in 1 0 seconds Calculate its acceleration

Answer 1

Explanation:

$vi = \frac{72km}{1h} = \frac{7200}{3600} = \frac{72}{36} = 2 \frac{m}{s}$

$vf = 30 \frac{m}{s}$

As we know that:

$a = \frac{vf - vi}{t}$

$a = \frac{30 - 2}{10}$

$a = \frac{28}{10}$

$a = 2.8 \frac{m}{ {s}^{2} }$

Answer:

2.8m/s^2

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Answer 2

Acceleration of Bus (a) :

a = ∆v/∆t

= (30 - [72×5/18]) / 10

= (30-20)/10

= 10/10

= 2 m/s²