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5.31
A box with mass 10.0 kg moves on a ramp that is inclined at
an angle of 55.
0
above the horizontal. The coefficient of kinetic fric
tion
between the box and the ramp surface is
=
0.300. Calculate the
mk
magnitude of the acceleration of the box if you push on the box with
a constant force F
=
120.0 N that is parallel to the ramp surface and
(a) directed down the ramp, moving the box down the ramp; (b) directed
up the ramp, moving the box up the ramp.