Some pitchers can pitch a baseball at speeds upwards of 100 miles per hour. The fastest pitch recorded in Major League Baseball in the 21th century was pitched by Aroldis Chapman while playing for the Cincinnati Reds. The pitch was clocked at 105.1 miles per hour. In the video below, Destin, from the YouTube channel SmarterEveryday builds a baseball cannon capable of shooting baseballs at supersonic speeds (above 700 miles per hour). Back in 2001, former Diamondbacks pitcher Randy Johnson throwing a baseball at nearly 100 miles per hour disintegrated a bird that flew into it in a puff of feathers. Destin shoots the baseball at two inch thick sheets of steel, but you can pretty much imagine from the results what such a pitch would do to a baseball bat or a catcher!
Back in the 16th century it was still believed that light objects would fall slower than heavy objects. The Italian scientists Galileo Galilei allegedly proved this theory to be wrong in a famous experiment where he dropped two balls of equal size but different masses from the leaning tower of Pisa. There is some controversy as to whether Galileo actually performed the experiment, but this experiment has been repeated in modern times in many ways. Two of such notable repetitions are shown below. The first is that carried out by astronaut Dave Scott of the Apollo 15 mission on the moon.
The second was conducted at NASA's massive Space Simulation Chamber in Ohio.