Which of newton's laws of motion is described as follows? a body at rest will stay at rest and a body in motion will stay in motion (with the same direction and velocity) unless acted upon by an external force?

Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

Which levels of government establish and implement educational requirements for minors