A 220 kg artillery shell leaves a naval gun at a velocity of 200 m/sec. If the recoil velocity of the gun is -10.0 m/sec, what is its mass? plz do it with a solution so that I could understand. Thank you:-)​

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Decreased sensitivity to an unchanging stimulus is known as

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.