Question

Is physics mostly maths?explain

Answer 1

Yes.
Physics is mostly math.
Physics to me is the math in science.
The maths and science behind daily theories is calculated by mathematical operation but is scientific.

Answer 2

On the basis of modern physics, the rules of the nature are both of quantum mechanics and general relativity property means that this field both use equation of both field, simply maths something correct and sometimes wrong, like mathematics fail to predict the real existence of white hole but correct in the decribing laws of relativity.
Classical physics use mostly your view on any topic, like a car moving on road and a man sitting in the car, from his view, world along with moon moving backwards, and he is stationary, and man on the footpath see that car is in motion.
Quantum physics is generally different, here mathematics and view is more changed, like your predict the future of a ball on the surface by using mathematics, but on the quantum mechanics property, the is in different places and different positions. So, basically lower physics is not mathematics but higher physics may be mathematics