Ao observarmos um navio se aproximando da praia vindo de alto mar, o que podemos perceber sobre ele em relação ao seu tamanho e forma. O que aparece primeiro?

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the dependent variable in galileo's experiment?