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Derivation of Position-Velocity Relation by Graphical Method

A balll throw...

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A balll thrown vertically upwards with a speed 'u' from the top of a tower reaches the ground in 9 seconds . Another ball thrown vertically downwards from the same position with the same speed 'u' , takes 4 seconds to reach ground. Calculate the value of 'u'. (Take g = 10m/s^2)

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Derivation of Position-Velocity Relation by Graphical Method

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