7-35. girl pulls a box of mass 20.8 kg
across
the floor. She is exerting a force on the box of 95.6 N, inclined at
35.0°
above the horizontal. The kinetic friction force on the box has a
magnitude
of 75.5 N. Use the work-energy theorem to determine the speed of the
box
after being dragged 0.750 m, assuming it starts from rest. [Ans. 0.45
m/s]
ACCUMULATED SOLUTION
Correct!
One of the following is
incorrect; which
one?
(A) Work done = Change
in
EK
(B) SFd = D( ½ mv2)
(C) SFd = DEK
(D)SFd = ½ m(v2 - v02)
(E)SFd = ½ m(v - v0)2