Question

Q.4. What is the kinetic energy of a 10 kg car that is moving 4 m/s?

Answer 1

An object of mass $10 \mathrm{~kg}$ is moving with a uniform velocity of $4 \mathrm{~ms}^{-1}$. The kinetic energy possessed by the object is $80 \mathrm{~J}$.

Given:

Mass of an object $=10 \mathrm{~kg}$

Velocity $=4 \mathrm{~ms}^{-1}$

Kinetic Energy $=1 / 2 \times$ Mass of Object $\times(\text { Velocity })^{2}$

$\Rightarrow$ Kinetic Energy $=1 / 2 \times 10 \times 4 \times 4$

$\Rightarrow$Kinetic Energy $=\underline{80 \mathbf{J}}$

What is Kinetic Energy?

• In physics, an object's kinetic energy is the energy it has as a result of its motion.
• It is defined as the amount of work required to accelerate a body of a given mass from rest to a certain velocity.
• The body retains its kinetic energy after gaining it during acceleration until its speed changes.
• Kinetic energy is present in a speeding bullet, a walking human, and electromagnetic radiation such as light. The energy associated with the continual, random bouncing of atoms or molecules is another type of kinetic energy.

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