Correct for one. I wouldn’t put belt too for two. The correct answer for 3 is 9.6 kg. I guess theI'll take a stab at it... 1) Most have more than one AMAAh! Sorry, I forgot to hide my answer...
1) Most machines have an actual mechanical advantage of more less one. True/False
2) The following is an example of what kind of simple machines?
3) A boy and a girl each sits on one end of a seesaw. When the 120 kg girl sits down, the boy rises/goes up by 0.4 m; when the boy sits down, the girl rise/goes up by 20 cm. How heavy is the boy in kilogram?
(Hope the wording isn’t too confusing)
2) Belt and Pulley, or just 2 pulleys
3) 60KG? I'm more than a bit confused on this question, is this even possible?
problem doesn’t make sense with a boy that weights 9.6 kg. (Ugh... If someone’s 9.6 kg they are probably still a baby/toddler, not a boy...) I was going to make him weigh 96 kg... How did you get 60 kg? Maybe I am wrong.