Two masses are connected by a string and pulled along a frictionless surface by anoth

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Ahmad786
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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?
 
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