see attach show solut...

PROBLEM 5.7 7. A shipping crate that weighs 300 N is initially stationary on a loading dock. A forklift arrives and lifts the crate with an upward force of 520 N, accelerating the crate upward. What is the magnitude of the force due to gravity acting on the shipping crate while it is accelerating upward? a. 18 m/s2 c. 19 m/s2 b. 17 m/s2 d. 16 m/s2 PROBLEM 5.9 10. A 430 N force accelerates a cart from 10 m/s to 18 m/s in 5 s. What is the mass of the cart? a. 278.75 kg c. 288.75 kg b. 268.75 kg d. 298.75 kg 12. Four weights, of masses mi = 6.50 kg, m2 = 3.80 kg, m3 = 10.50 kg, and m4 = 4.50 kg, are hanging from a ceiling as shown in the figure. They are connected with ropes. What is the tension in the rope connecting masses m, and mz? my a. 184.43 N b. 184.43 N C. 184.43 N m, d. 184.43 N m A