On Earth the force of gravity is 9.8m/s/s what is the mass of a falling object with a force of 20 N?

i think it's c. i'm not sure but i think so.

1. they vary with a higher number because boiling is way hotter than melting

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.