1.

Consider an elliptically shaped rail PQ in the vertical plane with OP 3m and OQ-4m. A block of mass1kg is pulled along the rail from P to Q with a force of 18 N, Which is always parallel to line PQ (see thefigure given). Assuming no frictional losses, the kinetic energy of the block when it reaches Q is (n x 10)joules. The value of n is (take acceleration due to gravity 10 msJEE (Advanced)-2014; P-1, 3/60]-290°

Answer»

here Kf -ki = work done by all forces

ki = 0 so, Kf = Wgravity + WforceKf = 18*5 -1*10*4 Kf = 90-40 = 50 = 5×10.

n = 5



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