Acrow who wants to eat a snail will drop it from a high place to crack the snail’s shell and expose the tasty flesh. in order to crack the snail’s shell, it must be going 15 m/s when it hits the ground. assume that the snail free falls. how high does the crow have to be when it drops the snail for the shell to crack?

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

1.   what is light?

light is an electromagnetic wave visible to the human eye. 

2. what is a reflection?

the rebounding of a light ray when it hits a mirror.

3. what is the incident ray?

contacts the surface of an object.

4. what is the reflected ray?

bounces off a reflective surface.

5. what is the normal ray?

perpendicular to the surface of a mirror.

6. what is the angle of incidence?

an angle formed by the incident ray and the normal.

7. what is the angle of reflection?

an angle formed by the reflected ray and the normal.

8. what is refraction?

(bending.)

9. what is a converging lens?

bring together light rays that pass through.

10. what is a diverging lens?

spreads out light passing through.

11. focal point?

the real point where the refracted rays meet when the incident rays run parallel.

i copy pasted btw from an website..