Question

a box of mass 500 grams is moving at a constant speed of 72 kilometre per hour what is the kinetic energy of the box​

Answer 1

Answer:

it comes to be 100 joules

Explanation:

we have taken the mass in kgs therefore 500 gms means 1/2 kgs

72 kmph is converted it to into meters per second it can be done by multiplying the speed with 5/18 which comes to be 20 meter per second

It can be explained like this

kinetic energy = 1/2*mass*velocity square

= 1/2*1/2*20*20

= 1/4 * 400

= 100.

Answer 2

here is your answer.

here we have to change it 500 gm into kg and 82 km/hr into m/s because the si unit of energy is kgm/s^2 .which is same as the si unit of work done.

and ya the next picture is the rainig solution of underlined equation in the first picture.

hope it will help you guys.