What must be happening, according to Newton's second law of motion, if a rigid body of unchanging mass is observed accelerating? A force is being applied to the mass.

A force was once applied but is now not being applied.

The mass must be changing.

No force was or is being applied to the mass.

The size is 8inches if ur a girl

Answerd. may include all of these are many definitions of bases: the  brønsted-lowry definition of acids and bases says that bases are proton acceptors.the arrhenius definition of acids and bases says that bases increase [oh⁻] in solution (thereby producing oh⁻ ions)the lewis definition of acids and bases says that bases donate electron pairs.therefore, the sensible answer is that a base may include all of the described characteristics.