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Question

One meter stick having mass 600 gm, pivoted at one end. And is displaced through an angle of 60, the increase in its potential energy is (g=10 m/s2)
1063398_a4521e1c3458404a843578a8234483f5.PNG

A
1.5 J
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B
15 J
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C
150 J
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D
0.15 J
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Solution

The correct option is A 1.5 J
The center of Mass will be at the center (mid-way) of the meter stick.
u=ufui

=(m.g.hcos60o)(mgh)
mghmgh.cos60o
=mg(hh2)=mgh2
u=0.6×10×14
u=+1.5J
A






























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