# Answer to Question #49875 in Mechanics | Relativity for tinu

Question #49875

If a ball is thrown vertically upward from the roof of 58.8 m , when will it fall on the earth??

the solution is like this

let the upper direction is positive

then we can write

-h=ut-1/2gt^2 and t=6s .

my question is why h =10 is used here. i have thrown the ball from 58.8m upward. then it should have a height to the up and when it will fall downward then after crossing the roof it should have a height of 58.8m. so why in these case that upper height is not used .

my same question is also for projectile thrown from a height. there, also the upper height is not counted why?? why only the given height is used to solve the problems.

the solution is like this

let the upper direction is positive

then we can write

-h=ut-1/2gt^2 and t=6s .

my question is why h =10 is used here. i have thrown the ball from 58.8m upward. then it should have a height to the up and when it will fall downward then after crossing the roof it should have a height of 58.8m. so why in these case that upper height is not used .

my same question is also for projectile thrown from a height. there, also the upper height is not counted why?? why only the given height is used to solve the problems.

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