Question

20. A 0.450-kg baseball comes off a bat and goes straight up. At a height of 10.0 m, the
baseball has a speed of 24.5 m/s.

a. Determine its mechanical energy at this height. Show your work.

b. What is the baseball's mechanical energy when it is at a height of 9.0 m? Explain your answer.

Answer 1

Answer:

for a 3.4950

for b 1.24950

Answer 2

Mechanical energy at 10.0  height =135.05625 joule

Mechanical energy when it is at a height of 9.0 m = 40.5 joule

What is mechanical energy?

• Mechanical energy is the energy associated with the motion and position of an object.
• It is the sum of potential energy and kinetic energy.
• For example, a moving ball possesses mechanical energy in the form of kinetic energy.
• A ball in the ground possesses mechanical energy in the form of potential energy.

Conservation of mechanical energy:-

a. At a height of 10.0 m having speed 24.5m/s

     kinetic energy= 1/2*mass*(speed)²

                               1/2*0.450*24.5*24.5

                               135.05625 joule

b.Mechanical energy at a height of 9.0 m

          kinetic energy is equal to change in potential energy

            potential energy= MGH

                                         0.450*10*9

                                        40.5 joule

Learn more about energy conservation here:-https://brainly.com/question/12306849

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