9. A 1.2 kg mass is connected via a pully to a 3.6 kg cart sitting on a frictionless incline as shown.When released the cart moves down the incline What is the magnitude of the acceleration of the cart? (A) 0.77m/s^2 (B) 1.0m/s^2 (C) 4.2m/s^2 (D) 5.7m/s^2

(A)