1. A car is travelling north at 17.7 m/s and begins to slow down. After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration. A) 0.30 m/s2, North B) 2.7 m/s2, South He Vel ill and the der to die C) 0.30 m/s2, South D) 2.7 m/$2, North A Vo Vf : Vosat Q Vf-Vo It will be mag sir VALVo. This inder 2. 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, N is the normal force on the crate by the floor, and W is the weight of the crate. How are the magnitudes of these forces related, while the person is trying unsuccessfully to lift the crate? The Crater is not rising TP LF = PIN-= ma : Q WAL IN A) P+N > W B) PINEW OP + N = W D) P = W