I don't know the name, but the opposite of gravity, if that helps!
Density is defined as mass per unit volume. It has the SI unit kg m-3 or Kg/m-3 and is an absolute quantity. Specific gravity is the ratio of a material's density with that of water at 4 °C (where it is most dense and is taken to have the value 999.974 kg·m-3). It is therefore a relative quantity with no units.
F=ma
11.6=3.8*a
a=11.6/3.8
a=3.05m/s
All of the above. They all right