To calculate the change in kinetic energy, you must know the force as a function of position. The work done by the force causes the kinetic energy change
Explanation:
The work-energy theorem states that the change in kinetic enegy of an object is equal to the work done on the object:

where the work done is the integral of the force over the position of the object:

As we see from the formula, the magnitude of the force F(x) can be dependent from the position of the object, therefore in order to solve correctly the integral and find the work done on the object, it is required to know the behaviour of the force as a function of the position, x.
The power the swimmer must provide to overcome that drag force is 50 W.
<h3>What is work done?</h3>
Work done is equal to product of force applied and distance moved.
Work = Force x Distance
Given is an athlete, swimming at a constant speed, covers a distance of 203 m in a time period of 5 minutes and 50 seconds = 350 seconds. The drag force exerted by the water on the swimmer is 86.0 N.
Work done by drag force is W= F x d
So, W = 86 N x 203 m
W = 17.458 kJ
Power , a swimmer is provided P = Work done/ Time
P = 17458 / 350
P = 50 W
Thus, the power, the swimmer must provide to overcome that drag force is 50 W.
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Answer:
The gravitational force is 
Explanation:
Given that,
Mass of large ball = 8.4 kg
Mass of small ball = 0.061 kg
Separation = 0.057 m
Gravitational constant 
We need to calculate the gravitational force
Using formula of gravitational force

Put the value into the formula


Hence, The gravitational force is 