Question

A bus decreases its speed from 80km to 50 km in 4 seconds. find the acceleration of the bus.​

Answer 1

Answer:-

• Initial velocity=80km/h
• Final velocity=v=50km/h

Convert to m/s

$\\ \sf\longmapsto 80\times \dfrac{5}{18}$

$\\ \sf\longmapsto 22.2m/s$

And

$\\ \sf\longmapsto 50\times \dfrac{5}{18}$

$\\ \sf\longmapsto 16.6m/s$

• Time=4s

We know that

$\boxed{\sf Acceleration=\dfrac{v-u}{t}}$

$\\ \sf\longmapsto Acceleration=\dfrac{22.2-16.6}{2}$

$\\ \sf\longmapsto Acceleration=\dfrac{-5.6}{2}$

$\\ \sf\longmapsto Acceleration=-2.8m/s^2$

Answer 2

Answer:

2.8 m per s

Explanation:

convert km per s into m per s