Question

If a bus decreases it speed from 100 km/h to 60 km/h in 5 s. find acceleration of the bus. 


-4 m/s^2

-5.4m/s^2

-2.2m/s^2

4m/s^2

please answer​

Answer 1

Answer:

The acceleration of the bus is -2.22 m/s².

Step-by-step explanation:

Given:

• Initial velocity (u) = 100 km/hr
• Final velocity (v) = 60 km/hr
• Time (t) = 5 seconds

To Find:

• Acceleration of the bus = ?

Solution:

To find the acceleration of the bus = ?

Before solving the question, let us convert the values of speed from km/hr to m/s.

• 100 km/hr = 100×$\dfrac{5}{18}$ = 27.7 m/s
• 60 km/hr = 60×$\dfrac{5}{18}$ = 16.6 m/s

Now,

$\implies \sf v = u + at$

$\implies \sf a = \dfrac{v-u}{t}$

$\implies \sf a = \dfrac{16.6-27.7}{5}$

$\implies \sf a = \dfrac{-11.1}{5}$

$\implies \sf a = -2.22 \ m/s^2$

$\therefore$ Acceleration of the bus is -2.22 m/s².