Question

What is the theory of Kinetic Theory?

Answer 1

Daniel Bernoulli's kinetic theory of matter states that all things – liquids, solids or gases – are made up of atoms and molecules that are in constant motion.

Answer 2

Explanation:

Given: d=3

We know:

an=a+(n−1)d

∴a20−a15=[a+19d]−[a+14d]

                     =5d

                     =5×3

                     =15

Hence, the answer is 15.