A river is 0.76 km wide. The banks are straight and parallel. The current is 4.0 km/h and is parallel to the banks. A boat has a maximum speed of 3.0 km/h in still water. The pilot of the boat wishes to go on a straight line from A to B, where AB is perpendicular to the banks. What should the pilot do? a-Take none of these actions. b-Head 22° upstream from the line AB. c-Give up-the trip from A to B since it is not possible with this boat. d-Head directly across the river. e-Head 68° upstream from the line AB. What I did: Since I know it forms a right triangle where angle theta is unknown 4km/h is the adjacent and .76km is the opposite so I did inverse tan 4/.76 and got 79 degrees. ------------------------------------------------- Which of the following statements are true? (Select all that apply and ignore any effects due to air resistance.) a-When a projectile is fired horizontally from a certain height, it has a higher speed upon reaching the ground than does an identical projectile dropped from rest from the same height. b-None of these statements are true. c-When a projectile is fired from a certain height at an upward angle, it takes longer to reach the ground than does an identical projectile dropped from rest from the same height. d-When a projectile is fired horizontally, it takes the same amount of time to reach the ground as an identical projectile dropped from rest from the same height. I chose C & D but it was wrong. I chose C because if shot in an upward, it takes extra time to reach its highest point where velocity is 0, then from there is the same as dropping from rest. I chose D because the only acceleration is from gravity so it would take the same amount of time to reach the ground. Am I wrong?