Aball is dropped from rest at point o . it passes a window with height 3.8 m in time interval tab = 0.02 s. identify the correct pair of equations, which enable us to solve for speed vb . assume down is the positive y direction. use g = 9.8 m/s 2 . k~vk = v is the speed of the ball.

The text compares alternating current with direct current. how are they different? a alternating current reverses direction in the electrical wiring. direct current flows in one direction only. b direct current reverses direction in the electrical wiring. alternating current flows in one direction only. c direct current is powered by solar energy. alternating current is powered by electrical energy. d alternating current does not move in the electrical wiring. direct current does move in the electrical wiring.