Question

A body of mass 2 kg is moving with a velocity of 2 m/s. Find the K.E. of the body.​

Answer 1

Explanation:

Final velocity of the body, v = 0.1 m/s

Mass of the body, m = 2 kg

To calculate :-

Kinetic energy

Formula to be used :-

1/2 mv²

Solution :-

⇒ K.E = 1/2 mv²

⇒ K.E = 1/2 × 2 × (0.1)²

⇒ K.E = 0.01 J.

Answer 2

Provided that:

• Mass of body = 2 kg
• Velocity = 2 mps

To calculate:

• The kinetic energy

Solution:

• Kinetic energy = 4 J

Using concept:

• Kinetic energy formula

Using formula:

• ${\small{\underline{\boxed{\pmb{\sf{E_k \: = \dfrac{1}{2} \: mv^2}}}}}}$

Where, E_k denotes kinetic energy, m denotes mass and v denotes velocity.

Required solution:

$:\implies \sf E_k \: = \dfrac{1}{2} \: mv^2 \\ \\ :\implies \sf E_k \: = \dfrac{1}{2} \times 2(2)^{2} \\ \\ :\implies \sf E_k \: = \dfrac{1}{2} \times 2(4) \\ \\ :\implies \sf E_k \: = \dfrac{1}{2} \times 8 \\ \\ :\implies \sf E_k \: = 4 \: J \\ \\ :\implies \sf Kinetic \: energy \: = 4 \: Joules$