The choices are confusing. Air, oil, and alcohol are fluids at any reasonable temperature. Dry cement is not.
Most likely it would be C not completely sure
True. No matter can be created nor destroyed in pretty much every aspect of life, especially chemical reactions.
If you are given distance and a period of time, you can calculate
the speed. The velocity of an object is the rate of change of its position with
respect to a frame of reference, and is a function of time. Velocity is
equivalent to a specification of its speed and direction of motion (e.g. 60
km/h to the north).
