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1a). a box with mass = 27.3 kg is sliding down a ramp at constant velocity...

1a). a box with mass = 27.3 kg is sliding down a ramp at constant velocity = 4.77m/s. ramp makes angle 15degress above horizontal. frictional force acts ln the box as it slides down. what is the net force on the box, in newtons? please show work.

1b). what is the frictonal force on the box, in newtons?
please show work.
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