A simple pendulum is released from A as shown. If m and λ represent the mass of the bob and length of the pendulum, the gain in kinetic energy at B is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Δ K + Δ U = 0; (K – 0) + (– mgh) = 0
K = mgh = mg ( λ – d), and
d = λ (1 – cos 30 0 )
∴ K = mg λ cos 30 0 = 
mg λ
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