a tennis ball machine fire a ball vertically upward at time t=0 at 19.6 m/s assume that air resistance is negligible and take g=9.8m/s ? calculate the displisment and velocity of t=1.0,2.0,3.0,4.0

A12-kg bag of groceries is tossed onto a table at 4.0 m/s and slides to a stop in 2.2 s . modify the equation fδt=δ (mv) to find the force of friction.

Asample of a gaseous substance changes into liquid. this process is called (blank) and it takes place when heat is (blank) a gaseous system

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance