A man steps into an elevator and onto a bathroom scale. After the elevator begins to accelerate upward at 3.9 m/s2, the scale gives a reading of 978.0 n. If he is carrying a sack of potatoes with a mass of 45.0 kg, find the mass of the man (in kg).
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W in lift if moving upwards
W = m(a+g)
Weight of potatoes
W = 45(3.9+10)
W = 625.5N
Total weight - Weight of potatoes = weight of man
W' = 978-625.5 =325.5N
W' = m(a+g)
325.5÷13.9 = m
So mass of man is 25.35 kg
W = m(a+g)
Weight of potatoes
W = 45(3.9+10)
W = 625.5N
Total weight - Weight of potatoes = weight of man
W' = 978-625.5 =325.5N
W' = m(a+g)
325.5÷13.9 = m
So mass of man is 25.35 kg
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