Is a machine that is a combination of 2 or more simple machines

Which of the following is not a part of a wave? question 2 options: a: frequency b: refraction c: wavelength d: amplitude (whoever answers correctly first gets brainiest! ) ~kayla

Anne applies a force on a toy car and makes it move forward. what can be said about the forces acting on the toy car at the moment anne applies the force?

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?