Question

A car acquires a velocity of 20 m/s in 10 sec, just after the start. Calculate the
acceleration of the car.​

Answer 1

Required Answer :

Acceleration = 2 m/s²

Explication of steps :

According to given question,

• Intial velocity (u) = 0 m/s [After the start i.e, car was at rest]
• Final velocity (v) = 20 m/s
• Time taken (t) = 10 sec

We have to find:

• Acceleration (a)

Acceleration refers to the rate of change in velocity with time.

$\boxed{\sf {Acceleration = \dfrac{v -u}{t} }}$

$\longmapsto$ a = $\sf \dfrac{20-0}{10}$ m/s²

$\longmapsto$ a = $\sf \dfrac{20}{10}$ m/s²

$\longmapsto$ a = 2 m/s²

Therefore, acceleration of the car is 2 m/s².

Points to remember :

• Acceleration is defined as rate of change in velocity with time.

• $\boxed{\sf {Acceleration = \dfrac{v -u}{t} }}$

• v denotes final velocity.
• u denotes initial velocity.
• t denotes time.

• SI unit of acceleration is m/s².

• Acceleration is a vector quantity.

• Negative acceleration is called retardation.