A ball weighing 200 g is released from a height of 10 meters. When it reaches the ground it has a speed of 10 m / s. How much work has the air resistance done on the ball during the fall? A: - 5.7 J B: - 9.6 J C: - 10 J D: - 20 J

Albert jumps in a rubber band from a bridge that crosses a river. At the bottom point of the jump avoids he just dipped his head in the water. It is 22 meters from the river up to the bridge. The elastic is 12 meters long when not stretched, and has a spring constant of 300 N / m. How much does Albert weigh? You can ignore the air resistance. A: 60 kg B: 65 kg C: 70 kg D: 75 kg

Albert jumps in a rubber band from a bridge that crosses a river. At the bottom point of the jump avoids he just dipped his head in the water. It is 22 meters from the river up to the bridge. The elastic is 12 meters long when not stretched, and has a spring constant of 300 N / m. How much does Albert weigh? You can ignore the air resistance. A: 60 kg B: 65 kg C: 70 kg D: 75 kg

can somebody please help with this ?