Question

a bus decreases its speed from 80 km h-1 to 60 km h-1 in 5 seconds. Find the acceleration of the bus

Answer 1

Answer:

-1.11 m/s²

Explanation:

Given:

A Bus decreases its speed from 80 km/h to 60 km/h in 5 seconds

To Find:

The acceleration of the bus

Solution:

We know that,

$\red{\implies \sf a=\dfrac{v-u}{t} \ m/s^{2}}$

Given that,

A Bus decreases its speed from 80 km/h to 60 km/h in 5 seconds

Hence,

u = 80 km/h

v = 60 km/h

Converting into m/s

[ divide the speed value by 3.6  ]

Therefore,

• u = 22.22 m/s
• v = 16.66 m/s
• t = 5 seconds

Hence,

Substituting the values,

We get,

$\blue{\implies \sf a=\dfrac{16.66-22.22}{5} \ m/s^{2}}$

$\green{\implies \sf a=\dfrac{-5.55}{5} \ m/s^{2}}$

$\pink{\sf \implies a=-1.11 \ m/s^{2}}$

Answer 2

given:-

u = 80km/h

v = 60km/h

t = 5 sec.

to find:-

acceleration

formula:-

$\huge \fbox \blue{a = v - u /t}$

Solution:-

a = $\bf\dfrac{60-80}{5}$

a = $\bf\cancel\dfrac{-20}{5}$ = -4

hence, acceleration is -4m/s²