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a) $F_a = 3.8 \times 10^2 N$
b) $W_a = -1.4 \times 10^3 J$
c) $W_{fr}=-4.1 \times 10^3 J$
d) $W_g=5.5 \times 10^3J$
e) $W_{net}=0$

(10:47)