A porter carries a 24N bag up a 6.0 m flight of stairs to a platform in 18s. He then throws the bag in a bin from the platform so it lands on the ground level after 3.5s.
How much work was done to lift the bag?
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Explanation:
t = 18 + 3.5 = 21.5s
W = 24 N
M = 2.4 kg
h = 6m
g = 10 ms^-2
Work done = mass * height * g
= 2.4 *6*10
= 144 J
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