Acannonball with a mass of 8.3 kg is fired from a cannon that has a mass of 949.3 kg. the cannonball is fired with a speed of 187.9 m/s, and it takes 0.0 seconds for the cannonball to leave the cannon. what is the recoil speed?

The mass of a muon is 207 times the electron mass; the average lifetime of muons at rest is 2.21 μs. in a certain experiment, muons moving through a laboratory are measured to have an average lifetime of 7.04 μs. for the moving muons, what are (a) β (b) k, and (c) p? the rest energy of the electron is 0.511 mev.

Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk,in meters?

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?