Question

Find the kinetic energy of a body having mass 20kg and momentum 40 kgm/s
A) 20 J,
B) 80 J,
C) 40 J,
D) 10 J​

Answer 1

$\huge{\bold{\underline{\underline{....Answer....}}}}$

$\huge{\bold{\underline{Given:-}}}$

P = 40 kgm/s.

m = 20 kg.

K.E = ?.

$\huge{\bold{\underline{Explanation:-}}}$

The relation between Kinetic energy and momentum is

$\huge{\boxed{\boxed{ K.E. = \frac{P^{2}}{2m}}}}$

Substituting the values.

${K.E = \frac{40^2}{2 \times 20}}$

${K.E = \frac{1600}{40}}$

${K.E = 40 J}$

$\huge{\boxed{\boxed{K.E = 40J}}}$

So,the Kinetic energy of the body is 40J (option --C)

Answer 2

Opt C

I hope this is helpful