A particle moving in the xy-plane has velocity vo=voxi^ +voyj^ at t=0. It undergoes acceleration a=bti^ -cvyj^, where b and c are constants. Find an expression for the particle's velocity at a later time t.

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.