At the start of his race, an 81-kg runner pushes against the starting block, exerting an average force of 1600 n . the force that the block exerts on his foot points 20∘ above the horizontal. determine the horizontal speed of the runner after the force is exerted for 0.28 s.

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.​

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement