1.
In case of S.H.M. the period of oscillation (T), is given by

3.
A body is said to move with Simple Harmonic Motion if its acceleration, is

4.
The resultant of two forces P and Q acting at an angle $$\theta $$, is

5.
Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by