Question

a car moving with 30 meter per second by applying brakes brought to rest in 2 second calculate the acceleration of the car

Answer 1

Answer:

retardation 15 m/s

Explanation:

Answer 2

Answer

• Acceleration of the car => -15m/s²

Given

• A car moving with 30 m/s by applying brakes comes to rest in 2 second.

To Find

• Acceleration of the car.

Step By Step Explanation

Given that ⤵

• Initial velocity = 30 m/s.

• Final velocity = 0 m/s.

• Time = 2 second.

So let's do it !!

By using first equation of motion

• v = u + at.

By substituting the values

$\longmapsto\sf0 = 30 + a \times 2 \\ \\\longmapsto\sf - 30 = 2a \\ \\\longmapsto\sf \cancel\cfrac{ - 30}{2} = a \\ \\ \longmapsto\sf \: a = \red { - 15 m /{s}^{2}}$

Therefore acceleration of the car => -15 m/s²

☆Equations of motion

• v = u + at

• s = ut + ½ at²

• 2as = v² - u²

__________________________