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28. 7+3 -5 = 5 N
29. D
=25/(50x10^-2)
k =50 N/m^2
27. F(normal)= W+ F
= (mxg) +F
= (2x10) + 10
F(normal) = 30N
28. balok dengan kecepatan konstan, a=0
jadi, gaya yang kekiri=gaya yang kekanan
7+3=F
F=10N