3. a person decides to go over Niagara Falls in a barrel. Assuming the barrel goes over with an initial downward velocity of 0.21 m/s, and it takes him 2.9 seconds to reach the bottom of the falls, what velocity will he and the barrel have when they crash into the water?

4. A cannonball is launched upward at a velocity of 87.1 m/s and an angle of 50 degrees above the horizontal. a) What is the maximum height the cannonball will reach? b) What is the full horizontal distance traveled by the cannonball?

5. In a local bar, a customer slides an empty beer mug down the counter for a refill. The bartender is momentarily distracted by the incredible World Cup final and does not see the mug, which slides off the counter and strikes the floor 1.80m from the base of the counter. If the height of the counter is 0.910 m, (a) with what velocity did the mug leave the counter? (b) What was the direction of the mug's velocity just before it hit the floor? (the angle)