Question

A car starts from rest and attains a velocity of 18km/h in 2 sec. find its acceleration and S.I. unit

Answer 1

Intial velocity u = 0 m/s.

Final velocity v = 18 km/hr = (18x1000)/(3600) = 5 m/s.

Time t = 2s

Finding Acceleration (a)v = u + at

5 = 0 + a*2

2a = 5

a = 5/2

a = 2.5 m/s².

Hence, the acceleration of the car is 2.5 m/s².

Answer 2

Hi there!

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Given :

Initial velocity (u) = 0 m/s.

Final velocity (v) = 18 km/h = (18 * 5 / 18) = 5m/s.

Time taken (t) = 2 sec.

To find ;

Acceleration (a)

Solution ;

we will use first equation of motion here ;

v = u + at

⇒ 5 = 0 + a × 2

⇒ 5 = 2a

⇒ a = 5 / 2

⇒ a = 2.5 m/s².

Hence, the acceleration acquired by the car is 2.5 m/s².

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Thanks for the question !

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