A blob of mass 5 kg is place on a table top.it is attached to a mass piece of 2kg by a light string that passes over a frictionless pulley.the table top exerts a frictional force of 7 N on the block (a) calculate the tension of the string

Answer 1

first get acceleration of the two masses

a = F/m = (2*9.81)/(7)

then:

mg - T = m a

2*9.81 - T = 2 a

T = 2 (9.81 - a)