- #1
gracy
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Homework Statement
:[/B]There is a wall of height 30 meters.From the top edge of the wall a ball is thrown up with a velocity of 5m/s.Find the time taken by the ball to come to the base of the wall.Take g=10 m/s^2
Homework Equations
:I usedV=u+at[/B]
The Attempt at a Solution
v=0 as ball will come to rest when it will reach at base of the wall.
u=5 m/s
a= - 10 m/s^2( negative because of chosen coordinate system)
so time come out to be 0.5 s
But it is wrong it should be 3s.
I think I am going wrong in taking final velocity equal to zero.
So I should rather use s=ut +1/2at^2