A load sack of total mass 200kg fall down from the floor of a trailer 4m high.calculate the work done by gravity on the load
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mass =200kg ,
height=4m
u= 0m/s
from second equation of motion
v² -u²= 2as
v² - (0)²= 2 ×10×4
v² = 80
we Know that work done =1/2×mass(v²-u²)
=1/2×200×(80-0)
=200×80
=8,000j
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