JEE Advanced 2014 Paper 1 Physics Q17

Physics · Work, Energy & Power

Problem

Consider an elliptically shaped rail PQ in the vertical plane with

OP=3\,\mathrm{m}

and

OQ=4\,\mathrm{m}

. A block of mass

1\,\mathrm{kg}

is pulled along the rail from P to Q with a force of

18\,\mathrm{N}

, which is always parallel to line PQ (see the figure given). Assuming no frictional losses, the kinetic energy of the block when it reaches Q is

(n\times10)

Joules. The value of

n

is (take acceleration due to gravity

=10\,\mathrm{m\,s^{-2}}

)