Question

A car decreases it's speed from 80kmph to 60kmph in 5seconds find the acceleration of the bus

Answer 1

Answer:

Explanation:

Correct Question,

A bus decreases its speed from 80 km per hour from 60 km per hour in 5 seconds calculate the acceleration of the bus.

Solution,

Here, we have

Initial velocity, u = 40 km/h = 40 × 5/18 = 22.2 m/s

As km/h to m/s = 5/18

Final velocity, v = 60 km/h = 60 × 5/18 = 16.7 m/s

Time taken, t = 5 seconds

To Find,

Acceleration, a = ?

According to the 1st equation of motion,

We know that

v = u + at

So, putting all the values, we get

v = u + at

⇒ 16.7 = 22.2 + a × 5

⇒ 16.7 - 22.2 = 5a

⇒ - 5.5 = 5a

⇒ - 5.5/5 = a

⇒ a = - 1.1 m/s².

Hence, the acceleration of the bus is - 1.1 m/s².