Question

A car accelerates uniformly from 18 km/hr to 36 km/hr in 5 sec. Calculate acceleration in m/s2

Answer 1

Answer:

1 m/s²

Explanation:

Given:

• Initial velocity = u = 18 km/hr
• Final velocity = v = 36 km/hr
• Time taken = 5 seconds

To find:

Acceleration of the car (a)

18 km/hr = $18 \times \frac{5}{18} = 5 \ m/s$

36 km/hr = $36 \times \frac{5}{18} = 10 \ m/s$

Acceleration = $\frac{V-u}{t}$

Acceleration = $\frac{10-5}{5}$

Acceleration = $\frac{5}{5}$

Acceleration = 1 m/s²

The acceleration of the car is equal to 1 m/s²

Answer 2

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✰Question ✰

⋄ A car accelerates uniformly from 18 km/hr to 36 km/hr in 5 sec. Calculate acceleration in m/s²

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✰ Given:-

⋄ Initial velocity of car (u) =18km/h= 18×5/18= 5m/s.

⋄ Final velocity of car (u) =36km/h=36×5/18=10m/s

⋄ Time taken (t) = 5s

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✰To Find :-

⋄ Acceleration of car (a)??

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✰Solution :-

By using 1st equation of motion

➧ v= u+at

➧ 10 = 5+ a × 5

➧ a = 5/5

➧ a = 1m/s²

∴The acceleration of the car is 1m/s².

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✰Extra information :-

⋄ Acceleration :- The rate of change of velocity at per unit time is called acceleration.

⋄ SI unit of Acceleration is m/s²

⋄ It is vector quantity.