Help asap for 20pts
1. A hawk is flying with a speed of 20.0 m/s over water when it accidentally drops a 2.5 kg fish. If the altitude of the bird is 5.0 m and friction is disregarded, what is the mechanical energy of the system, and what is the speed of the fish when it hits the water?
2. A 740 N diver drops from a board 8.0 m above the water’s surface. Find the mechanical energy of the system, and find the diver’s speed 4.0 m above the water’s surface.
3. A runner leaps over a hurdle. If the runner’s initial vertical speed is 2.0 m/s, how much will the runner’s center of mass be raised during the jump?
4. A pendulum bob is released from some initial eight such that the speed of the bob at the bottom of the swing is 2.2 m/s. What is the initial height of the bob?
5. Is conservation of mechanical energy likely to hold in these situations?
​a. a hockey puck sliding on a frictionless surface of ice
​b. a toy car rolling on a carpeted floor
​c. a baseball being thrown into the air