Answer:
a
b
Explanation:
From the question we are told that
The mass of the ball is
The radius is
The speed is
The speed of the attached cord is
The position that is been considered is h
Generally according to the law of angular momentum conservation
Here is the initial momentum of the ball which is mathematically represented as
while
is the momentum of the ball at r = 2 ft which is mathematically represented as
So
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Generally the resultant velocity of the ball is
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Generally according to equation for principle of work and energy we have that
Here is the initial kinetic energy of the ball which is mathematically represented as
While is the sum of the total workdone by the ball
and is the final kinetic energy of the ball which is mathematically represented as
So
Here m is the mass which is mathematically represented as
here W is the weight in lb and g is the acceleration due to gravity which is
So
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