Question

find velocity of a body of mass 100g having KE 20J

Answer 1

given, kinetic energy is 20J

mass of the body is 100g=0.1kg

now, kinetic energy =1/2 mv^2

20=0.5× 0.1× v^2

400=v^2

v=20m/s


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Answer 2

Answer:

20 m / sec .

Explanation:

Given :

Kinetic energy is 20 J

Mass of body is 100 g .

In term of kg :

Mass of body is 0.1 kg

We have :

K.E. = 1 / 2 m v²

Putting values here we get :

20 = 1 / 2 × 0.1 × v²

0.1 × v² = 40

v² = 400

v = √ 400

v = 20 m / sec .

Thus the final velocity of body is 20 m / sec .