Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, the first having a mass of 150,000 kg and a velocity of 0.300 m/s, and the second having a mass of 95,000 kg and a velocity of -0.120 m/s. (The minus indicates direction of motion.) What is their final velocity? ............m/s

A 1150 kg car drives along a city street at 20.0miles per hour (8.94 m/s). What speed must the 0.142 baseball have if its momentum is to be equal in magnitude to that of the car?

Your mass is 69.1 kg, and you are standing on a frictionless, frozen pond. You throw a 0.430 kg football horizontally with a speed of 5.5 m/s in one direction, and you recoil in the opposite direction. 1)  What is your speed, in meters per second, after throwing the football?

Two ice skaters stand facing each other at rest on a frozen pond. They push off against one another and the 48 kg skater acquires a speed of 0.69 m/s. If the other skater acquires a speed of 0.84 m/s, what is her mass in kilograms?

During a football game, a receiver has just caught a pass and is standing still. Before he can move, a tackler, running at a velocity of +3.9 m/s, grabs and holds onto him so that they move off together with a velocity of +2.3 m/s. If the mass of the tackler is 125 kg, determine the mass of the receiver in kilograms. Assume momentum is conserved. kg

Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, the first having a mass of 180,000 kg and a velocity of 0.300 m/s, and the second having a mass of 125,000 kg and a velocity of −0.120 m/s. (The minus indicates direction of motion.) What is their final velocity (in m/s)? (Enter a number.)m/s

On a horizontal frictionless table, masses A and B (3 kg, 5 kg) slide to the right and left, respectively. They have speeds of 3 m/s and 1 m/s, respectively. The two masses collide, and bounce off each other. After the collision, they travel in opposite directions at speeds of 1.5 m/s and 1.700 m/s, respectively. (Note:In this problem, please use + dir = right, - dir = left, to indicate direction.) a.) Calculate A's momentum: before collision: kg-m/s after collision: kg-m/s Make sure you understand why it is NOT conserved. b.) Calculate B's momentum: before collision: kg-m/s after collision: kg-m/s Make sure you understand why it is NOT conserved. c.) Calculate the A+B system's momentum: before collision: kg-m/s after collision: kg-m/s Make sure you understand why it IS conserved. d.) Calculate the kinetic energy of the A+B system: before collision: after collision: J What kind of collision is this v ---Select--- elastic somewhat inelastic Submit Answer completely inelastic

A loaded gun is dropped on a frozen lake. The gun fires, with the bullet going horizontally in one direction and the gun sliding on the ice in the other direction. The bullet's mass is 0.03 kg, and its speed is 295 m/s. If the gun's mass is 2.5 kg, what is its speed (in m/s)?  m/s

A 3.9-kg model rocket is launched, shooting 49.3 g of burned fuel from its exhaust at an average speed of 588 m/s. What is the speed of the rocket after the fuel has burned (ignore gravity and air resistance). Answer: + m/s