2. You throw a 2 kg ball upward with an initial velocity of 20 m/sec. About 4 seconds later, the ball returns and you catch it.
9.8 m/s
0.0 m/s
o o o o
4.9 m/s
19.6 m/s
CLEAR ALL
What is the magnitude of the velocity at the top of the ball's upward path? (Neglect
Friction and assume on or near the earth's surface.]

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?