2. A 2.0 kg box starts at rest on a flat, frictionless sheet of ice. A...
2. A 2.0 kg box starts at rest on a flat, frictionless sheet of
ice. A steady Texas wind then exerts on the box the force
� ⃑ = (230 N)�̂−(110 N)�̂, given in unit- vector notation, where
the x direction is east and the y direction is north. In response
to this force, and as a result of a frictionless rock ledge that
constrains the box’s direction of motion, the box ends up with a
displacement of 5.0 meters east and 2.0 meters north.
(a) How much work did the wind do during this displacement?
(b) If all the work done on the box became kinetic energy, what was
the final speed of the box?
Homework Answers
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