Question

find the kinetic energy of a body having mass 20 kg and Momentum 40 kg/ second​

Answer 1

Answer:

we know that KE=1/2MV^2

Momentum=pv

Explanation:

here momentum=40

mass =20

hence substitute the value of the respective values

momentum=MV

40=20×V

V=2

HENCE,

KE=1/2MV^2

=1/2×20×2^2

=40

HENCE

KE=40

Answer 2

The kinetic energy of body is 40 Joules.

Explanation:

Given that : Mass of the body, m = 20 kg

Momentum of the body, p = 40 kg-m/s

To find : The kinetic energy of the body.

Solution :

Momentum of an object is given by the product of mass and its velocity. It is given by :

$p=mv$

Putting the value of p and m in above formula to find the value of v as:

$v=\dfrac{p}{m}$

$v=\dfrac{40}{20}$

v = 2 m/s

The kinetic energy of an object is possessed due to its motion. It is given by :

$K=\dfrac{1}{2}mv^2$

$K=\dfrac{1}{2}\times 20\times 2^2$

K = 40 J

Hence, the kinetic energy of body is 40 Joules.

Learn more :

Kinetic energy

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