The power used by Alex to drag the log across the yard is determined as 2,656 W.
Mass of the log
The mass of the log is calculated as follows;
W = mg
m = W/g
m = (400)/9.8
m = 40.82 kg
Velocity of the log
K.E = ¹/₂mv²
v² = 2K.E/m
v² = (2 x 900)/(40.82)
v² = 44.096
v = 6.64 m/s
Power used by Alex
P = Fv
P = 400 x 6.64
P = 2,656 W
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