I need to understand the solution.

Blood, like other liquids, is governed by the laws of physics as it falls. it will accelerate to the earth as other objects as a rate of 9.8 m\s\s and the force of air resistance will slow its fall. if the droplets fall at a 90 degree angle to a relatively non-porous surface the resulting pattern will be an almost perfect circle. (e.g. try dropping red paint from an eyedropper directly above a white piece of paper). blood droplet with an angle of impact at 90 degreeswidth of droplet = 2.5 cm length of droplet= 2.5 cm = 1what angle has the sine of 1? 90 degreesas the angle of impact decreases a distortion of the droplet results. the droplet travels as a projectile and the bottom of the droplet will hit the floor first while top will continue along its path and result in a spatter elongation and sometimes a tail. the tail of the droplet corresponds to the direction the blood travels.sin x = width of stain\length of stain