Question

An 8.0 kg block is released from rest, v1 = 0 m/s,
on a rough incline. The block moves a distance of
1.6 m down the incline, the work done by the weight
is closest to:

file:///Users/123456/Desktop/Document1.htm

a) +80 J
b) +100 J
c) +120 J
d) -100 J
e) -80 J

Answer 1

Answer on Question#41011, Physics, Mechanics Question: An 8.0 kg block is released from rest, v1 = 0 m/s, on a rough incline. The block moves a distance of 1.6 m down the incline, the work done by the weight is closest to: a) +80 J b) +100 J c) +120 J d) -100 J e) -80 J

Solution. Formula for work is

$A=F\cdot\Delta S$

where $F$ is force and $\Delta S$ is distance. Hence

$A=mg\cdot\Delta S=8\cdot 9.8\cdot 1.6\approx 120\,J$

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