Question

Calculate the velocity of a body of mass 40 kg having kinetic energy of 320 J.

Answer 1

Answer:

Kinetic energy= 1/2 mv^2

320j = 1/2*40kg * v^2

320 j = 20kg * v^2

320/20= v^2

√16 = v^2

4 = v

the velocity of a body is 4m/s .

Answer 2

The velocity of the body is 4 m/s

Given : The body of mass 40 kg having kinetic energy of 320 J.

To find : The velocity of the body.

Solution :

We can simply solve this numerical problem by using the following process. (our goal is to calculate the velocity of the body)

Here, we have to use the following mathematical formula.

Kinetic energy = ½ × mass × (velocity)²

Here,

• Kinetic energy = 320 J
• Mass = 40 kg

By, putting the available data in the above mentioned mathematical formula, we get :

320 = ½ × (40) × (Velocity)²

(Velocity)² × 20 = 320

(Velocity)² = 320/20

(Velocity)² = 16

Velocity = √16

Velocity = 4 m/s

(This will be considered as the final result.)

Hence, the velocity of the body is 4 m/s