Someone throws a ball upward with an initial velocity of vi. use the free fall equations to determine and show the final velocity vf the ball has when it returns to the height from which it was released (hint you want a final equation that contains those two variables and no others). (further hint: what hidden information can you get from the phrase ""returns to the height from which it was released""? ) ignore air resistance.

so final velocity is same as initial velocity but its direction is opposite to the direction of initial velocity

Explanation:

As we know that when ball throw upwards and again reached to same position then we will have

so its displacement is zero

now by kinematics we will have

so we have

so we have

so final velocity is same as initial velocity but its direction is opposite to the direction of initial velocity

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

wavelength divides in half and speed stays the same.