3. a crew team rows a boat at a rate of 20 km/h in still water. beginning at time = 0 minutes, the team rows for 30 minutes up a river (against the current). the speed of the current is 1.5 km/h. how long will it take the crew team to row down the river (with the current) to return to the starting point?

30 min
22 min
26 min
24 min

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.