17. Two masses are connected by a string and pulled along a frictionless surface by another string one is 5kg and the other is 10 kg to which a tension of 40.0 N is applied. The magnitude of the system’s acceleration is A. 8.0 m/s2 B. 20 m/s2 C. 13 m/s2 D. 2.7 m/s2 (For this question I added the two masses to get the mass and then I used the equation a=f/m to find the acceleration) Is D. the correct answer?