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The bird perched on the swing has a mass of 48.0 g, and the base of the swing has a mass of 159 g. The swing and bird are originally at rest, and then the bird takes off horizontally at 1.20 m/s. How high will the base of the swing rise above its original level? Disregard friction.

1 answer

first use conservation of momentum to get swing speed at bottom

Vswing = Vbird (Mass bird/Mass swing)
then

m g h = (1/2) m Vswing^2
or
h = Vswing^2/(2 *9.81)
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