Isn't the net force 48 because both the 30 N and the 18 N of tension are moving in an upward direction.
48 = M(3.2-9.8)?
*edit: never mind I found the solution.. Thanks so Much!"
Homework Statement
Two masses are joined together by a massless, inextensible string. A vertical force of 30 N applied to the upper mass gives the system a constant upward acceleration of 3.2 m/s^2.
If the tension in the connecting string is 18 N, what is the smaller of two masses?
If the...