KVPY SA Exam 2011 Question Paper

Question : 16 of 80

Marks: +1, -0

PHYSICS

A simple pendulum oscillates freely between points A and B.

We now put a peg (nail) at some point C as shown. As the pendulum moves from A to the right, the string will bend at C and the pendulum will go to its extreme point D. Ignoring friction, the point D

will lie on the line AB
will lie above the line AB
will lie below the line AB
will coincide with B

Validate

Solution:

According to law of conservation of mechanical energy

K_i + U_i = K_f + U_f

0 + U_i = 0 + U_f

h_i = h_f

Point D is at line AB

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