Question

Find the kinetic energy of a body of mass 500 g moving with a speed of 10 m/s.

Answer 1

Given:

• Mass of body = 500 g = 0.5 kg
• Velocity of the body = 10 m/s

To find:

• K.E ( Kinetic energy )

Solution:

As we know that

K.E = 1/2 mv²

Where

• K.E : Kinetic energy = ?
• m : mass of body = 0.5 kg
• v : velocity = 10 m/s

Substituting t,he values we have

→ K.E = 1/2 (0.5)(10)²

→ K.E = 1/4 × 100

→ K.E = 25 kgm/s or J

Hence , Kinetic energy of the body = 25J

Answer 2

$\large \bf \red{ \underline{ \underline{Given:-}}}$

• Mass of the body = 500g

• Speed of the body = 10m/s

$\large \bf \blue{ \underline{ \underline{To\:Find:-}}}$

• The kinetic energy of the body.

$\large \bf \green{ \underline{ \underline{Solution:-}}}$

☞︎︎︎ The kinetic energy of a body is given by the formula:-

$\boxed{ \rm \pink { \rightarrow K. E= \frac{1}{2} m {v}^{2} }}$

Here:-

• K.E = Kinetic Energy

• m = mass of the body

• v = velocity/speed of the body

Substituting the values:-

${ \rm { \rightarrow K.E= \dfrac{1}{2} (0.5) ({10)}^{2} }}$

${ \rm { \rightarrow K.E= \dfrac{1}{2} (0.5) ({100)}}}$

${ \rm { \rightarrow K.E= 0.5 \times {50}}}$

$\rm \rightarrow K.E= 25$

$\large\boxed{ \rm \purple{ \therefore Kinetic \: energy \: = 25J}}$