a ball is dropped from the top of the building it requires a velocity of 80m/s-² on reaching the ground. calculate the height of the building.take g=10m/s-
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To find:-
- The height of building
Solution:-
As the ball will fall down a constant acceleration will act on ball downwards which is due to gravitational force. Hence we can apply 3 equations of motion.
In simple words we can find the height of building using three equations of motion.
Using 3rd equation will be appropriate here
as body starts falling from top hence initial velocity is zero. Final Velocity is given 80m/s and acceleration we already know is 10m/s²
Hence putting the values:-
Note that:-
- V=Final velocity
- U=Initial velocity
- a= acceleration
- s=height of building
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