Consider an elliptically shaped rail PQ in the vertical plane with OP= 3m and OQ=4m. A block of mass 1kg is pulled along the rail from P to Q with a force of 18N. Which is always parallel to line PQ (see figure). Assuming no frictional losses, the kinetic energy of the block, when it reaches Q, is (n x10) j. The value of n is (take acceleration due to gravity =10 ms-2 )
