Later, parents used cloth and thread (线) to make budai for their kids' schoolbags. They were much lighter. With the start of New China, green military rucksacks became popular. Your grandparents or parents used these schoolbags when they were in school. Today's schoolbags ar...
everything. above you can see it all. both heavier and lighter things can fall faster. clearly, you can't just say "heavier is faster". acceleration of falling objects let's look at the case of a falling bowling ball and basket ball. this is a force diagram showing the two objects. ...