Question

Date:
H.
A bus decreases its speed from 80 km / hr
to 60km / hr in 5 sec. find the acceleration
of the bus.​

Answer 1

Explanation:

the bus is decelerating at a rate of -1.11 m/s2.

Answer 2

Given data,

$initial \: speed \: (u) = 80 \frac{km}{hr} \\ = 80 \times \frac{100}{3600} \frac{m}{s} \\ = 2.23 \frac{m}{s}$

$final \: speed(v) = 60 \frac{km}{hr} \\ = \frac{60 \times 100}{3600} \frac{m}{s} \\ = 1.67 \frac{m}{s}$

$time(t) = 5s$

To calculate,

$acceleration(a) = ?$

Calculations,

$a = \frac{v - u}{t} \\ = \frac{1.67 - 2.23}{5} \\ = \frac{ - 0.56}{5} \\ = - 11.2 \times {10}^{ - 2} \\ = - 0.112$

Final answer,

acceleration of the bus is -0.112 m/s²

(note that,

negative sign indicates decrease in speed of car)

hope it helps to you☺️