A woman is straining to lift a large crate, without success. It is too heavy. We denote the forces on the crate as follows: P is the upward force being exerted on the crate by the person, C is the contact force on the crate by the floor, and W is the crate’s weight. How are the magnitudes of these forces related, while the person is trying unsuccessfully to lift the crate? a.P = C b.P + C > W c.P + C < W d.P + C = W Is it that P + C = W if in equilibrium? P + C - W = 0; P + C = W Thanks.