PLEASE HELP!! Two football players with mass 120 kg and 90 kg run directly toward each other with speeds 8 m/s and 5 m/s respectively. After they collide, the larger player continues forward with a speed of 2 m/s. What is the new speed of the second player?

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.