a) $p_{fb_i}=380 kg \cdot m/s$

b) $\Delta p_{fb} = -380 kg \cdot m/s$

c) $\Delta p_t = 380 kg \cdot m/s$

d) $F_t = 5.1 \times 10^2 N$

a) $p_{fb_i}=380 kg \cdot m/s$

b) $\Delta p_{fb} = -380 kg \cdot m/s$

c) $\Delta p_t = 380 kg \cdot m/s$

d) $F_t = 5.1 \times 10^2 N$