Consider an elliptically shaped rail PQ in the vertical plane with OP = 3 m and OQ = 4 m - Physics - Work Energy And Power

Question

Consider an elliptically shaped rail PQ in the vertical
plane with OP = 3 m and OQ = 4 m A block of mass
1 kg is pulled along the rail from P to Q with a
force of 18 N, which is always parallel to lien 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)

Kiruthika · Accepted Answer

Dear student,
Using Work Energy theorem,we know
Work done=Change in poptential energy+change in kinetic energyF×r=P
Ef-P Ei+K Ef-K Ei18×5=mgh-0+K
Ef-018×5=1×10×4+K EfK Ef=90-40K Ef=50JAs K
Ef=(n×10)Jn=5

Regards