**Question 7:** Derive 3^{rd} equation of motion.

**ANSWER**

For the derivation of 3^{rd} equation of motion, we
use the relation between distance S and average velocity and the 1^{st}
equation of motion.
We know that

The
1^{st} equation of motion states that

Substitute for‘t’ in the above equation (1)

This is 3^{rd} equation of motion.

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