Aball is thrown upward with an initial velocity of 48 ft/s from a height 864 ft. h = -16t +48t +864 after how many seconds will the ball reach the ground? (i. e. for what positive value of t is h=0? )

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?

The velocity of a car traveling in a straight line increases from 0 meters/second to 30meters/second in 8 seconds. what is the average acceleration of the car?