The quantity of matter contained in a body is called mass .si unit of mass is kilogram.weight is effected by gravity but mass is not effected by gravity.
the quantity of matter contained in a body is called mass .si unit of mass is kilogram.weight is effected by gravity but mass is not effected by gravity.
A collision means the event in which two or more bodies exert forces on each other in about a relatively short time. And only Elastic works with this definition.
