Question

a bus decrease its speed from 80km h-1to 60km h -1 in 5 s. find the acceleration of the bus ​

Answer 1

Answer:

-1.11 m/s²

Explanation:

Given:-

• Initial velocity = 80km/hr

• Final velocity = 60 km/hr

• Time = 5s

To Find:-

• Find Acceleration =?

Procedure:-

>> Let's start by converting km/hr into its standard unit m/s.

We know, 1km = 1000m & 1hr = 3600s

So, 80 km/ hr be :-

$\sf \: initial \: speed(u) = \dfrac{80 \times 1000}{3600} = \dfrac{800}{36} = 22.22m {s}^{ - 1}$

$\sf \: final \: speed (v)\: = \dfrac{60 \times 1000}{3600} = \dfrac{600}{36} = 16.66 {ms}^{ - 1}$

>> Using First Equation of Motion:-

${\boxed{ \bf{v = u + at}}}$

$\implies \sf \: 16.66 = 22.22 + 5a$

>> Flippin' the equation:-

$\implies \sf \: 5a + 22.22 = 16.66$

>> Subtracting 22 from both sides:-

$\implies \sf \: 5a + 22.22 - 22.22 = 16.66 - 22.22$

$\implies \sf \: 5a = - 5.56$

>> Divide 5 to both sides.

$\implies \sf \: \dfrac{5a}{5} = \dfrac{ - 5.56}{5}$

${ \boxed{ \implies \tt{a = - 1.11 {ms}^{ - 2} }}}$

About equations of motions:-

• First equation of motion :

➝ v = u + at

This equation connects Velocity and Time.

• Second equation of motion:

➝ s = ut + ½ at²

This equation connects Displacement and time.

• Third equation of motion.

➝ 2as = v² - u²

This equation connects Velocity and Displacement.

• What is momentum ?

The linear momentum of a body is defined as product of mass and velocity.

• Odometer is a device used to measure the distance traveled by vehicle.

• Distance is directly proportional to time².

• If a body travels unequal distance in equal interval of time then it is said to be non uniform motion.

• If a body travels equal distance in equal interval of time then it is aid to be in uniform motion.

• Instataneous speed is the speed in particular instance of time.

Answer 2

Answer:

HOW R U

Explanation:

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