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7. A ball is thrown vertically downward from the edge of a bridge 24.0 m high with an initial speed of 12.0 m/s. The ball falls all the way down and strikes the water below. Determine the time it takes the ball to strike the water. 3.75
8. A photographer in a helicopter ascending vertically at a constant rate of 1.2 m/s accidentally drops m above the ground. (a) How long will it take the camera to reach the ground? a camera out the window when the helicopter is 23.0 -21.2 9. (b) What will its speed be just before it hits the ground? m/s
10. An object initially at rest experiences an acceleration of 1.40 m/s2 for 5.40 s then travels at that constant velocity for another 9.30 s. What is the magnitude of the objects average velocity over the 14.7 s interval? m/s
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