Question

A driver applies the brakes and slows down the velocity of the bus from 80 k/ h to 60 km/h in 5 sec. calculate the retardation of the bus....please give the right answer otherwise I'm screwed! ​

Answer 1

$\Large{\underline{\underline{\bf{Solution :}}}}$

We know that,

$\Large{\implies{\boxed{\boxed{\sf{a = \frac{v - u}{t}}}}}}$

Where,

• a is acceleration
• v is inital velocity = 80 km/h = 22.22 m/s
• u is final velcoity = 60 km/h = 16.67 m/s
• t is time taken = 5 s

______________[Put Values]

$\begin{lgathered}\sf{→ a = \frac{22.22 - 26.67}{5}} \\ \\ \sf{→a = \frac{-\cancel{5.55}}{\cancel{5}}} \\ \\ \sf{→a = -1.11 \: ms^{-2}} \\ \\ \Large{\implies{\boxed{\boxed{\sf{a = -1.11 \: ms^{-2}}}}}}\end{lgathered}$

$\rule{200}{2}$

★ Additional information :

★ Uniform Acceleration : When a object is moving with same speed and with same interval of time it is known as uniform Acceleration. For example : A car is moving with 75 km/h. After 1 hour it's speed is same.

★ Non - Uniform Acceleration : When a object is moving with same speed but with different same interval of time it is known as Non - uniform Acceleration. For example : A car is moving with 75 km/h. After 1 hour it's speed is different