Blocks A and B are moving toward each other along the x axis. A has a mass of 2 kg and a velocity of 50 m/s, while B has a mass of 4 kg and a velocity of -25 m/s. They collide head-on in an elastic collision. After the collision the velocities of A and B, respectively, are:

1) what is the power in horsepower of a 100 watt light bulb? what is the power in kilowatts of a 200 horsepower engine? 2) if a cars engine is providing 3000 n of force to keep the car moving at 5 m/s, what is the engine’s effective power? 3) how many gallons of water will be pumped from a well 30 feet deep by a 1/2 hp engine in 1 minute? (1 gallon weighs 8.34 pounds)