A 15 kg mass is moving at 7.5 m/s on a horizontal, frictionless surface. What is the total work that must be done on the mass to increase its speed to 11.5 m/s?
Answer:3.1-kilogram gun initially at rest is free to move. When a 0.015-kilogram bullet leaves the gun with a speed of 500. meters per second, what is the speed of the gun?= (1/2) (15)(11.5^2 - 7.5^2),570
