Physics

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Two books of masses m1=10kg and m2= 20kg are connected by a rope. The horizontal force on the more massive box is 900 N. Assume there's no friction.
a) what is the acceleration of the more massive box
b) Acclereration of the less massive box

a) f=ma
900=20a
a=45m/s^2
b) f=ma
900=10a
90m/s^2 =a
did i do this problem correct?

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