A child is swinging a swing, Minimum and maximum heights of swing from earth's surface are 0.75 m and 2 m respectively. The maximum velocity of this swing is :
Text Solution
Verified by ExpertsThe correct answer is:
A
Maximum kinetic energy of swing should be equal to difference in potential energies to conserve energy.
From energy conservation
mv 2 max = mg (H 2 – H 1 )
Here, H 1 = minimum height of swing from
earth's surface = 0.75 m
H 2 maximum height of swing from
earth's surface = 2m
∴ 
mv 2 max = mg (2 – 0.75)
or vmax = 
= 
= 5 m/s
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