33. Two towns A and B are situated directly opposite each other on the banks of a river whose width is 0.8 km and which flows at a speed of 4 m/s. A man located at A wishes to reach town C which is 2.0 km upstream from and on the same side of the river as town B. If his boat can travel at a maximum speed of 50 km/hr and if he wishes to reach C in the shortest possible time, what course must he follow and how long will the trip take?7. A cannonball is shot from the top edge of a vertical cliff at a velocity of 57.3 m/s 200 up from horizontal. If the cannonball lands a horizontal distance of 323 m from the base of the cliff, calculate the height of the cliff. .Show that a projectile achieves its maximum range if it is shot at an angle of 450