Answer:
no poop comes out from your but
Explanation:
Mechanical advantage of a machine is the ratio of the output force over the input force or M=Fo/Fi. Since M=1, Fi=Fo, or the input force is equal to the output force. This means that to raise the refrigerator that weighs 900 N, we need the same input force of 900 N, or Fo=Fi=900 N.
Protons have a positive charge which is indicated by a + sign.
Hence, the answer is C.
