Question

a car starting from rest and moving with uniform acceleration attains a speed of 72 km per hour in 5s. find its acceleration. ​

Answer 1

Answer:

1/15m/s^2

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Answer 2

Answer:

4 m/s² = Acceleration

Explanation:

As per the provided information in the given question, we have :

• Initial velocity (u) = 0 m/s (As it starts from rest)

• Final velocity (v) = 72 km/hr

• Time taken (t) = 5 s

We are asked to calculate acceleration of the car.

Converting final velocity in m/s as initial velocity is in m/s :

⇒ 1 km/h = 5/18 m/s

⇒ 72 km/h = (5/18 × 72) m/s

⇒ 72 km/h = (5 × 4) m/s

⇒ 72 km/h = 20 m/s

∴ Final velocity is 20 m/s²

Finding acceleration :

Acceleration is the rate of change in velocity in unit time. It is a vector quantity. 

By using the formula of acceleration,

⇒ A = (v - u)/t

• v denotes final velocity

• u denotes initial velocity

• a denotes acceleration

• t denotes time

⇒ Acceleration = $\rm\dfrac{20 - 0}{5}$

⇒ Acceleration = $\rm\cancel{\dfrac{20}{5}}$

⇒ Acceleration = 4 m/s²

∴ Acceleration is 4 m/s²