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Assume that a tunnel is dug across the e...

Assume that a tunnel is dug across the earth (radius=R) passing through its centre. Find the time a particle takes to reach centre of earth if it is projected into the tunnel from surface of earth with speed needed for it to escape the gravitational field to earth.

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`T = sin^(-1)((1)/(sqrt(3)))sqrt((R_(e))/(g))`
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