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If a hollow pipe passes across the centr...

If a hollow pipe passes across the centre of gravity of the Earth, then what changes would take place in the velocity and acceleration of a ball dropped in the pipe ?

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Let the vectors `vecA and vecB` represent the sides OP and OR of a triangle OPR. Let `theta ` be the angle between the vectors `vecA. vecB.`
The area of the triangle OPR is :

`1/2 xx ` base `xx ` height `= 1/2 xx (OP) xx RS `
`= 1/2 xx (OP) xx (OR sin theta)`
`= 1/2 AB sin theta `
`= 1/2 |vecA xx vecB|`
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