Question

A body starts from rest accelerates to a velocity of 20 m/s in a time of 10 s. Determine the acceleration of the body.

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

$\therefore$ Acceleration of body is 2 m/s²

_______________________________

• 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

Answer 2

Answer:

Given

v = 20 m/s , u = o m/s

t = 10 s

Formula

V = U + at

Explanation:

20 = 0 + a× 10

20 = a× 10

a = 20 /10

a = 2 m^2 /s

Acceleration = 2 m^ 2 /s

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