You observe a boat that is being rowed northward at a velocity of 4 km/hr directly across a river in water that is flowing downstream in an eastward
direction at a rate of 9 km/hr. What is the approximate resultant velocity of the
boat?

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.