Question

Q23. A body of mass 60 kg is moving with a speed 50 m/s. Find its kinectic energy. ,​

Answer 1

Given question:

★A body of mass 60 kg is moving with a speed 50m/s . Find it's kinetic energy?

Known :

→ m = 60kg

→ u = 0 m/s

→ v= 50m/s

Unknown:

• Kinetic energy

Formula:

★→ Kinetic energy =1/2(m×v²)

Solution:

we put the given value in this formula, so

=> K. E= 1/2(60×50²)

= 30× 2500

= 75000 kgm/s²

Hence, the kinetic energy of the body is 75000kgm/s or 75KJ.

❀More information :

• the kinetic energy of an object is the energy that possesses due to it's motion.

Answer 2

Question :

A body of mass 60 kg is moving with a speed 50 m/s.

Find its kinetic energy

Answer :

Kinetic energy = 75 KJ

Given :

• Mass of body, m = 60 kg
• Speed of the body, v = 50 m/s

To find :

• Kinetic energy

Solution :

  $\underline{\underline{\bf Kinetic \ energy :}}$

     ★   It is the energy possessed by an object because of its motion.

     ★   It is a scalar quantity i.e., it does not have direction.

     ★   Units : Joule (J)

⇒ The equation for Kinetic Energy is :

           $\boxed{\bf KE=\frac{1}{2}mv^2}$

 where

    m - mass of the body

     v - speed of the body

• Mass of body, m = 60 kg
• Speed of the body, v = 50 m/s

         

 $\huge{\text{KE of the body}$

            $= \frac{1}{2} \times 60 \times 50^2 \\\\ = \frac{1}{2} \times 60 \times 2500 \\\\ =30 \times 2500 \\\\ =75000 \ J \\\\ = \text{75 KJ}$

║ Kinetic Energy of the body = 75 KJ