how is h= -ut + 1/2 gt^2
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- How can we say that h = -ut+½at² .
We know that the second equation of motion , which establishes the relationship between Displacement , initial Velocity , time and acceleration is :-
• Second equation of motion :-
This is valid for straight line motion , but when a object is projected vertically ( at 90° ) , then here , the
Displacement becomes Height .
Accelⁿ becomes gravity .
Also here we see that , the
- g acts vertically downwards .
- Initial velocity is in upwards dirⁿ .
Now , if we take downwards direction as positive , then the acceleration due to gravity will be positive ( since it a acts downwards ) and the initial velocity will be negative ( since its direction is upwards ) . Henceforth , by sign convention the equation transforms into ,
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