Question

Q) A body of mass 2 kg is moving with a speed of 20 m s -1 find its kinetic energy

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Answer 1

Given:-

• Mass of body = 2kg
• Speed of body = 20m/s

Find:-

• Kinetic Energy

Solution:-

we, know that

$\underline{\boxed{\sf Kinetic \: Energy = \dfrac{1}{2} m {v}^{2} }}$

where,

• Mass, m = 2kg
• Final Velocity, v = 20m/s

So,

$\dashrightarrow\sf Kinetic \: Energy = \dfrac{1}{2} m {v}^{2}$

$\dashrightarrow\sf Kinetic \: Energy = \dfrac{1}{2} \times 2 \times {(20)}^{2}$

$\dashrightarrow\sf Kinetic \: Energy = \dfrac{1}{2} \times 2 \times 400$

$\dashrightarrow\sf Kinetic \: Energy = \dfrac{1}{2} \times 800$

$\dashrightarrow\sf Kinetic \: Energy = \dfrac{800}{2}$

$\dashrightarrow\sf Kinetic \: Energy = 400 J$

$\small{\therefore\sf Kinetic \: Energy = 400 J}$

Thus, Kinetic Energy of the body is 400J

Answer 2

Answer:

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