Question

Kinetic energy possessed by a body of mass 2kg moving at speed of 3m/s is​

Answer 1

Kinetic Energy

Kinetic energy is the energy possessed by a body on virtue of its motion. It is represented as K.E and measured as Joule (J).

For solving this question, We need to note down the basic formula for finding Kinetic Energy:

$\large{\boxed{\rm{KE = \frac{1}{2} m {v}^{2}}}}$

This implies, "the kinetic energy is directly proportional to the mass of the body."

Where m is the mass of the body and v is the velocity of the body.

So, let's solve this question....

Solution:

We have,

• Mass, m = 2kg
• Speed/Velocity, v = 3m/s
• Kinetic Energy, KE = ?

By substituting the given values in the formula, we get the following results:

$\implies KE = \dfrac{1}{\cancel{\;2\;}} \times \cancel{\;2\;} \times (3)^2$

$\implies KE = 1 \times 9$

$\implies \large{\boxed{\rm{KE = 9\; J}}}$

Hence, the Kinetic energy possessed by the body is 9 Joule (J).

Answer 2

Kinetic Energy

Kinetic energy is defined as the energy of an object which has owing to it's motion. It is equal to half of an object's weight multiplied by the velocity squared.

As we went through the concept about Kinetic energy, Now, Let's move on finding the solution for our Question.

We know that, It is given that,

• Mass of an body = $\sf{2\:kg}$
• Velocity of an body = $\sf{3\:m/s}$

We also know that, the formula is,

${\boxed{\bullet{\:KN\:=\:{\dfrac{1}{2}}mv^2}}}$

where,

• KN - Kinetic energy
• m - mass of the body
• v - velocity of the body

Substituting values in Formula, we get,

$\implies\sf{KN\:=\:{\dfrac{1}{2}}\:\times\:2\:\times\:3^2}$

$\implies\sf{KN\:=\:{\dfrac{1}{{\cancel{2}}}}\:\times\:{\cancel{2}}\:\times\:9}$

$\implies\sf{KN\:=\:9\:J}$

Hence, the kinetic energy possessed is = 9 Joule