Question

If an object of mass 5 kg is moving with velocity
4 m/s, then find its kinetic energy.​

Answer 1

Answer:

40 joule

Explanation:

K.E.=1/2mv²

=1/2(5)x(4)²

=1/2(80)

=40joule

Answer 2

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40Joules

${\huge{\boxed{\mathcal{\red{Explanation}}}}}$

Kinetic energy of an object is the energy due to its motion. kinetic energy is measured in joules.

For an object its kinetic energy is equals to half of the product of its mass and square of its velocity. Mathematically it is represented by the equation :

$k.e = \frac{1}{2} \times m {v}^{2}$

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In this question we have been given the mass of object and the velocity with which it is moving. Kinetic energy of this object is not known we have to calculate it.

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Given :-

Mass of body = 5kg

Velocity of body = 4m/s

Now its kinetic energy will be :

$k.e = \frac{1}{2} \times m {v}^{2} \\ \\ k.e = \frac{1}{2} \times 5 \times {4}^{2}$

$k.e = \frac{5 \times 4 \times 4}{2}$

$k.e = 5 \times 4 \times 2 = 40joules$

Thus we get kinetic energy if given body to be 40joules.

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More to know :-

• The potential energy of a body is the product of its mass, acceleration and height
• Law of conservation of energy says that total mechanical energy of a body remains conserved if no external force acts on body.

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BY SCIVIBHANSHU

THANK YOU

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