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 18 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 × 10) joules. The value of n is (take acceleration due to gravity = 10 ms –2 )
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CHECK THE SOLUTION.
(5)
Sol. W F + W g = K f - K i
18×5 + 10 (-4) = K f
90 - 40 = K f
K f = 50J = 5×10J
n = 5
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