Question

A bus decreases if speed by 80km/h in 5 s the acceleration of the bus is m/s square​

Answer 1

Answer:

this is your answer....4.44m/s square.

Explanation:

hope it helps you....

sorry for handwriting....

Answer 2

Correct Question

A bus decreases its speed by 80km/h in 5 s, the acceleration of the bus in m/s² is

Given:

Change in velocity,Δv= -80 km/h

Time taken by bus, t= 5 s

To Find:

Acceleration of bus

Solution:

We know that,

• Acceleration a is given by

$\pink{\boxed{\bf{a=\dfrac{\triangle v}{t} }}}$

where,

Δv is change in velocity

t is time taken

$\rule{190}{1}$

It is given that,

$\rm{\triangle v=-80\ km/h=-80\times\dfrac{5}{18}\ m/s=\dfrac{-200}{9}\ m/s}$

Now, let the acceleration of car be a

So,

$\longrightarrow\rm{a=\dfrac{\triangle v}{t}}$

$\longrightarrow\rm{a=\dfrac{\dfrac{-200}{9}}{5}}$

$\longrightarrow\rm{a=\dfrac{-200}{9\times5}}$

$\longrightarrow\rm{a=\dfrac{-200}{45}}$

$\longrightarrow\rm\green{a=-4.44\ m/s^{2}}$

(Negative sign represents that acceleration of bus is in opposite direction or bus is retarding)

Hence, the acceleration of bus is -4.44 m/s².