Question

Alex dragged a log across the yard in 30 the log weighted 400n she did 900 j of work how much power did I she have

Answer 1

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

Learn more about power here: brainly.com/question/13881533

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