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When to use the formula of projectile motion and when to use the formulas of straight line motion, if you are at a height and throwing a stone at ground?

When to use the formula of projectile motion and when to use the formulas of straight line motion, if you are at a height and throwing a stone at ground?

Grade:11

3 Answers

Sumit Majumdar IIT Delhi
askIITians Faculty 137 Points
6 years ago
Dear Student,
When you are dropping or throwing the stone towards a point on the ground exactly vertiaclly downwards, then you use the straight line motion equations as the stone would be moving in a vertical direction only. Though if you give some horizontal velocity as well to the stone, then along with a horizontal motion, there would be a vertical motion as well, which results into a projectile motion.
Regards
Thanks & Regards
Sumit Majumdar,
askIITians Faculty
Ph.D,IIT Delhi
VISHESH DHARAIYA
17 Points
6 years ago
THANK YOU SIR....!!! 
Sumit Majumdar IIT Delhi
askIITians Faculty 137 Points
6 years ago
Dear student,
You can use projectile formula if there is a horizontal velocity imparted to the stone, but if the particle is dropped, then it would be the straight line motion formulae which needs to be applied.
Regards
Sumit

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