Q1. A charge of -2.2×10-9 C is at the origin and a charge of 6×10-9 C is on the x-axis at x = 3m. At what two locations on x-axis (xpositive, xnegative) is the potential zero?

Q2. A student is running to catch the campus shuttle bus that is stopped at bus stop. The student is running at a constant speed of 6.0 m/s; she can't run any faster. When the student is still 60.0 m from the bus, it starts to pull away. The bus moves with a constant acceleration of 0.18m/s^2. For how much time and how far does the student have to run before she overtakes the bus?