Physics URGENT!!!
posted by Anonymous .
Two boxes of fruit on a frictionless horizontal surface are connected by a light string as in the figures below, where m1 = 15 kg and m2 = 17 kg. A force of 58 N is applied to the 17 kg box.
(a1) Determine the acceleration of the boxes (b) the tension of the string (c)

58=(m1+m2)a solve for a
Tension between=m2*a 
I still don't understand how to find the tension of the string!