Question

Calculate the kinetic energy of a body of mass 6kg has momentum 12kgm/s. (Kinetic and Momentum is KE=p^2/2m

Answer 1

Answer:

12 joules

Explanation:

mass=6 kg

p=12 kgm/s

KE=p²/2m

   =144/2×6

   =12 joules

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Answer 2

Answer:

The kinetic energy of the given body is 12J

Explanation:

Given that,

The mass of body=6kg

The momentum of body=12kgm/s

Let the velocity of body be 'v' m/s.

The momentum of body is given by relation

$P=mv$

Substituting known values,we get

$12 = 6 \times v = > v = 2ms {}^{ - 1}$

Now,the kinetic energy of body can be found using the relation

$K.E = \frac{1}{2} mv {}^{2}$

Substituting known values,we get

$K.E = \frac{1}{2} \times 6 \times 2 {}^{2} = 12 \: joule$

Therefore,The kinetic energy of the given body is 12J

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