4. At her highest point, a girl on the swing is 6.5ft. Above the ground, and at her lowest point, she is 2.8ft, above the ground. What is her maximum velocity (fps)?

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Work and Energy
4.
At her highest point, a girl on the swing is 6.5ft. Above the ground, and at her lowest point, she
is 2.8ft, above the ground. What is her maximum velocity (fps)?
5.
What is the average horsepower required to raise a 200kg box to a height of 23m over a period
of 3 minutes?
6.
An arrow with a mass of 78g is fired from a bow whose string exerts an average force of 142 N
on the arrow over a distance of 650 mm. What is the speed of the arrow as it leaves the bow?
Transcribed Image Text:Work and Energy 4. At her highest point, a girl on the swing is 6.5ft. Above the ground, and at her lowest point, she is 2.8ft, above the ground. What is her maximum velocity (fps)? 5. What is the average horsepower required to raise a 200kg box to a height of 23m over a period of 3 minutes? 6. An arrow with a mass of 78g is fired from a bow whose string exerts an average force of 142 N on the arrow over a distance of 650 mm. What is the speed of the arrow as it leaves the bow?
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