Question

A car travelling at 20 km/h speeds up to 60 km/h in 30 minutes. Its acceleration is:

Answer 1

Answer:

Acceleration = 80km/h²

Explanation:

Given,

Initial velocity of a car = 20km/h

Final velocity = 60km/h

We need to find its acceleration.

We know,

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

Where,

• v(final velocity) = 60km/h
• u(initial velocity) = 20km/h
• t(time) = 30min or, 0.5h

Substituting the given values,

$\sf \longrightarrow \: \dfrac{v - u}{t}$

$\sf \longrightarrow \: \dfrac{60 - 20}{0.5}$

$\sf \longrightarrow \: \dfrac{40}{0.5}$

$\sf \longrightarrow \: 80 {km/h}^{2}$

∴ The car accelerates 80km/h²

______________________

Formula used :

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

Where, v denotes the final velocity, u is the initial velocity and t is time taken.

S. I. unit of acceleration is m/s²