A ball is dropped from a high rise platform at t=0 starting from rest. After 6s another ball is thrown downwards from the same platform with a speed v. what is the value of v? (take g=10m/s^2)

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle