Select all situations in which the acceleration of the ball is - 9.8 m/s/s a. A boy throws a ball up into the air.
b. As the ball travels upward.
c. When the ball is at the top of its path.
d. When the ball is falling down.

In a system, when potential energy decreases, then entropy also decreases. true false

Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point