Question

iii )A body starts from rest accelerate to a velocity of 20 m/s in a time of 10 s. Determine the

acceleration of the boy.​

Answer 1

Given :

Initial velocity (u) = 0 m/s

Final velocity (v) = 20 m/s

Time interval (t) = 10 s

To Find :

Acceleration of the body

Solution :

Concept : We are given time interval, initial velocity and Final velocity. We can find value of acceleration using Kinematics equations. Here we will use 1st equation of the kinematics .

Calculation :

➠ v = u + at

⇒at = v - u

⇒a = (v - u)/t

⇒a = (20 - 0)/10

⇒a = 20/10

⇒a = 2

Acceleration of body is 2 m/s²

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Acceleration is defined as Rate of change of velocity.

It is a vector quantity.

acceleration is denoted by “a”.

SI unit of acceleration is m/s²