Question

1) A man lifts a parcel, mass 4 kg, from the floor to a shelf 2 m high. a) What is the weight of the parcel? b) How much work is done on it? c) Where does this energy come from?

Answer 1

$\sf\large{\underline{\underline{Answer :}}}$

$\rm{(a)\:Weight=4\:kg×10=40\:N}$

$\rm{(b)\:Work\:done=force×distance\:moved}$

$\rm{\implies{40\:N×2\:m}}$

$\rm{\implies{80\:joules}}$

$\rm{(c)\:This\:energy\:comes\:from\:his\:food}$