Forces of 30N and 55N , the object accelerated to the left at 0.5m/s2
The net force acting on the object can be calculated by adding the two forces together:
Net force = 30N + 55N
Net force = 85N
Using Newton's second law (F = m*a) we can find the mass of the object:
85N = m * 0.5m/s^2
m = 170 kg
Therefore, the mass of the object is 170 kg.