Consider an elliptically shaped rail \( P Q \) in the vertical plane with \( O P=3 \mathrm{~m} \....

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Consider an elliptically shaped rail \( P Q \) in the vertical plane with \( O P=3 \mathrm{~m} \) and \( O Q=4 \mathrm{~m} \). A block of mass \( 1 \mathrm{~kg} \) is pulled along the rail from \( P \) to \( Q \) with a force
\( \mathrm{P} \)
of \( 18 \mathrm{~N} \), which is always parallel to line \( P Q \) (see the figure given). Assuming no frictional losses, the kinetic energy of the block when it reaches \( Q \) is \( (n \times 10) \) Joules. The value of \( n \) is (take acceleration due to gravity \( =10 \mathrm{~ms}^{-2} \) )


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