10. Some rabbits can jump as high as four feet. Calculate the rabbit's vertical speed when the rabbit leaves the ground. (Hint: Use 32.2 ft/s instead of 9.81 m/s. Also, what is the rabbit's speed at the top of the jump?) 11. There is a 250-m-high cliff at Half Dome in Yosemite National Park in California. Suppose a boulder breaks loose from the top of this cliff. What velocity will it be going when it strikes the ground? (Hint: Assume upward is the positive direction.) 12. In the image below, what does the direction of the velocity and acceleration vectors in part (a) and (b) indicate about the car's motion in each part? (a) y (b) 13. To the right is a position vs time graph for a toy car. Between t=0 s and t 10 s, the toy car has a small acceleration. Between t = 10 s and t = 20 s, the toy car moves with constant speed. Draw a sketch of the velocity vs time and acceleration vs time graphs for the toy car. Position (m) a v a Position vs. Time x 4.82 4.8 4.78 4.76 4.74 4.72 4.7 4.68 0 0 5 10 15 20 25 Time (s) 14. A coin is dropped from a hot-air balloon that is 300 m above the ground and rising at 10.0 m/s upward. For the coin find the maximum height reached and the time it takes the coin to reach the ground.