Physics (10th Edition)

a) $F_{net}$ = ma = 3 x 5 = 15 N $F_{net}$ = $F_{1}$ + $F_{2}$ 15 = 9 + $F_{2}$ $F_{2}$ = +6 N b) $F_{net}$ = ma = 3 x -5 = -15 N $F_{net}$ = $F_{1}$ + $F_{2}$ -15 = 9 + $F_{2}$ $F_{2}$ = -24 N c) $F_{net}$ = ma = 3 x 0 = 0 N $F_{net}$ = $F_{1}$ + $F_{2}$ 0 = 9 + $F_{2}$ $F_{2}$ = -9 N