Object a has mass m and is traveling forward with speed v. which set of changes to object a will not affect its momentum?
mass reduced to 0.5m, speed increased to 2v
mass reduced to 0.25m, speed increased to 1.25v
mass increased to 2m, speed increased to 2v
the direction of velocity reversed, speed kept at v
it never decreases so, false
the answer is c because when the chemicals on the tip of a match are heated up from friction it ignites.
air is a mixture and not a pure substance.