When a punter kicks a 0.42 kg football, it has an initial speed when it leaves the punter's foot of 23.0 m/s. After traveling 38 m horizontally down the field, the ball is caught by the other team at the same height as the point from where it was kicked (i.e. the initial and final heights of the ball are the same). If the speed of the football just before it is caught is 18.4 m/s, how much work was done by air resistance to the football as it traveled through the air? Assume that air resistance is the only non-conservative force acting on the football. 2. Balto pulls a person on a sled up a 15 frictionless slope. At one instant, the sled accelerates up the slope at 0.5 m/s 2 . If the sled and the person have a combined mass of 149 kg, what is the magnitude of the pulling force by Balto on the sled at this instant? Air resistance is negligible. A -48.6 J B -52.6 J C -51.2 J D -45.8 J E -40.0 J A 74.5 N B 303 N C 378 N D 1,485 N E 452 N