Question

a 4 kg block tied to another block, is pulled to the right by a tension force t=78 n the. The system accelerates to the right at 2 m/s^2 . fi the frictional force is on 4 kg is 20 n what is the tension in the string connecting both blocks?

Answer 1

78 - T - 20 = 4 a = 8
-T = 8 + 20 - 78 = -50
T = 50 N