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A bus decreases its speed from $80 km / hr$ to $60 km / hr$ in $5 s$ . The acceleration of the bus is ____ $m / s^{2}$ .

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Detailed Solution

A bus decreases its speed from

80 km / hr

60 km / hr

5 s

. The acceleration of the bus is

- 1.11 m / s^{2}

.
The initial velocity of bus,

u = 80 km / hr

= 80 \times \frac{5}{18}

= 22.22 m / s

The final velocity of bus,

v = 60 km / hr

= 60 \times \frac{5}{18}

= 16.67 m / s

The given time,

t = 5 s

The acceleration,

a = \frac{v - u}{t}

= \frac{16.67 - 22.22}{5}

= - 1.11 m / s²

The acceleration of the bus in

5 s

is equal to

- 1.11 m / s²

. Here negative signs indicate retardation.

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