Question

to calculate the work need for a bird mass 150g to fly to a hight of 20m away from the surface of the earth if required , take g 9.8

Answer 1

Answer:

work done= force × displacement

force and displacement are in opposite direction so work is negative

F= 150×10= 1500 mN=1.5N

W=-(1.5×20)

=-30 Joule