Two basketballs of equal mass collide in midair. If the initial velocity of Basketball A was to the right at 2.5 m/s and the initial velocity of Basketball B was to the left at 1.7m/s, what is the final velocity of Basketball A if the collision is perfectly elastic? Group of answer choices

Aparticle initially moving east with a speed of 20.0 m/s, experiences an acceleration of 3.95 m/s, north for a time of 8.00 s. what was the speed of the particle after this acceleration, in units of m/s? give the answer as a positive number.

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?