Question

a boy mass 18kg is running woth speed 12km/hr.find the kinetic energy possessed by body

Answer 1

hii mate here is the answer to your question:-
given---- mass (m) = 18kg.
speed or velocity ( in case of a straight line)
=12km/hr.
as we are aware of the fact that K.E = 1/2mv^2
therefore, kinetic energy = 1/2×18×12^2
=9×144=1267 joule.
hope this helps you
keep smiling

Answer 2

mass of the boy is 18kg
speed of boy is 12km/he

convert km into m

12×5/18
2×5/3
10/3 m/s

$kinetic \: energy = \frac{1}{2} \times mv {}^{2} \\ = \frac{1}{2} \times (\frac{10}{3} ) {}^{2} \times 18 \\ = \frac{1}{2} \times \frac{100}{9} \times 18 = 50 \times 2 = 100$
100J is the answer