20 is what percent of 52? plz help!
2 answers:
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Answer:
t = 5 seconds
Step-by-step explanation:
It is given that, the height h, in feet of a ball above the ground is given by :
Where t is in seconds
We need to find how long does it take the ball to hit the ground? When it hits the ground, its height will be equal to 0. So,
Neglecting negative time.
It means ball will take 5 seconds to hit the ground.
Answer:
2580 ft-lb
Step-by-step explanation:
Water leaks out of the bucket at a rate of
Work done required to pull the bucket to the top of the well is given by integral
Here, function is the total weight of the bucket and water
feet above the bottom of the well. That is,
is the initial height and
is the maximum height of well. That is,
Find the work done as,
Hence, the work done required to pull the bucket to the top of the well is