If a girl is swinging and another girl sits with her such that the position of cetre of gravity remains unchanged ,so the speed of swing will be
A) increased.
B) decreased
C) no change
D) none of these
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Answer:
Correct option is B)
T=2π
l
eff
/g
;l
eff
decreases when the child stands up.
T=2π
g
L
If L is the distance between the centre of mass of the mass to the point of suspension, when the boy stands, his centre of mass is raised and L will decrease. Therefore, the time will decrease.
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