Question

What is different between constant and variable in C++?

Answer 1

A constant can be declared by keyword final in this the value of that variable remind constant throughout the program and don't change whereas the other variable which is not declared constant can be changed.

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Answer 2

if the angle θ is 90 degrees how can the work done by F⃗ on the object is zero. Now consider a force acting on an object, but the object moves in a direction perpendicular to the force