274. The four identically scaled graph options below show how the net force changes on a box being pushed through a distance of 2 m. Select the graph that will result in the greatest change in kinetic energy of the box. (A) F(N) 4 2 0 X (m) 0 1 2 (B) F(N) 4 2 0 X (m) 0 2 (C) F(N) 4 2 0 X (m) 0 1 2 (D) F(N) 4 2 0 X (m) 0 1 2 V = 0 3.5 m V = 5.0 m/s 2.0 m 275. In its initial state, the 75-kg wrecking ball shown in the diagram above is released from rest at a distance of 3.5 m off the ground. After swinging back and forth multiple times, it's captured in its final state swinging up at a speed of 5.0 m/s at the instant it is 2.0 m off the ground. Determine the total work done by dissipative forces (such as air drag and pivot friction) on the pendulum system between its initial and final states. (A) OJ (B) -190 J (C) -560 J (D) -1,700 J 276. A Ping-Pong ball of mass m experiences a changing air drag force as it falls from rest of a roof of height h in a gravitational field g. If the average air drag force is symbolized as F, derive an expression for the final speed of the ball. (A) 2h(mg-F) Fh (B) m (C) 2gh (D) 2hF m m V = 0 6.0 meters F(N) 40. 20. 0 0 Ax (m) 6.0 277. A person pulls a 25-kg block of dry ice (initially at rest) with a changing force as shown in the diagram and graph above. The block moves a distance of 6.0 m along a frictionless table in 3.2 s of time. Determine the power output of the person. (A) 56 W (B) 75 W (C) 90 W (D) 180 W