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
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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
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