Sat July 28, 2012 By:

in my wuestion befor how ist coming as 4 n isnt it f=ma giving -4*1= -4n

Expert Reply
Sat July 28, 2012
you asked for force of friction.
The name itself suggest an opposing force so it really doesnt matter if we dont put any negative mark in the answer.
but that negative mark is to be put in the calculations
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