Q1. A charge of -1.5 × 10-9 C is at the origin and a charge of 9.1 × 10-9 C is on the x-axis at x = 3 m. At what location on x-axis is the electric field zero?
Q2. A hotel elevator ascends 170 {rm m} with a maximum speed of 5.90 {rm m/s}. Its acceleration and deceleration both have the magnitude of 1.3 {rm m/s^2}.