Mixture is constituted by more than one substance in any ratio. For example, water, soil, polluted air, etc.

A pure substances is one which is made up of only one kind of atoms or molecules. They have the same composition throughout.

Class 9th Science Session 2022-23 Class 9 Science Terminal Exams MCQ Solutions 9th Science Terminal Exam Based MCQ Extra Questions Class IX Science MCQ Extra Questions Answers

As momentum, p = m x v = 0.2 x 400 = 2/10 x 400 = 80 kg m/s

More force is needed to stop a cricket ball (which has more mass) and less force is needed to stop a tennis ball (which has less mass). The force required to stop a moving ball is proportional to mass (m) ...