A 3 kg object is pushed horizontally on a frictionless surface for 2 m. What is the work done by gravity on the object? (Take g = 10 m/s2)
Options
A
0 J
B
3 J
C
30 J
D
60 J
Answer & Analysis
Answer
A
Analysis
The work done by gravity on the object
depends on the direction of the force and displacement. Gravity acts vertically
downward, while the object is pushed horizontally.
Since the displacement is horizontal and
gravity acts vertically, the angle between the force of gravity and the
displacement is . The work done by gravity is given by:
Where:
is the gravitational force,
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