What is the acceleration of the car in initial 2 seconds [ans:20m/s^2

What causes the development of most clouds and precipitation in the atmosphere?

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.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this