Question

Heya!!!!


Hoping your help with this question with enough explanation
:-))

Answer 1

angle made by wheel barrow to ground when it is raised to 1m
let a be point below pivot
since tan a=100/120
tan a=5/6
which means angle is 40
so work done =f ×cos d
=600×0.76
=450 j

Answer 2

Answer is A. This is an approximated solution.