An 880 kg cannon at rest fires a 12.4 kg cannonball forward at 540 m/s. what is the recoil velocity of the cannon? (unit m/s)

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.

What are known as the properties of substances that describe a substance et does not change that substances?

There is no gravity in outer space . explain why this statement is true or false