Bus travellling through town, with a mass of 5040kg and kinetic energy of 493900j. i need the velocity.

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

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.