Question

answer fast...

Q.1. A boy lift the box of 20 kg
vertically upward by 2m height,
find the work done on the box
against gravity?​

Answer 1

let us assume g = 9.8 m/s*s

Now,

work done by you = gain in PE[potential energy](at ideal conditions)

therefore

PE = 20*9.8*2(but for this we make an assumption that PE at ground is 0)

Work done is 392 joules