A girl swings on a playground swing in such a way?

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K-T

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A girl swings on a playground swing in such a way that at her highest point she is 3.7 m from the ground, while at her lowest point she is 0.7 m from the ground.
The acceleration of gravity is 9.8 m/s2 .

Part A:
What is her maximum speed?
Answer in units of m/s

Part B:
Given: In the following choices, htop is the height of the highest point and hbot is the height of the lowest point.
At what height above the ground will the girl be moving at a speed half of her maximum speed?
Answer in units of m
 
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