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AlexFokin [52]
3 years ago
7

44. ( John weighs 80 kg, and eats a 1,000 J candy bar. If his

Physics
1 answer:
Darina [25.2K]3 years ago
4 0

John can run with the velocity of 5 m/s

Explanation:

  • Kinetic energy is defined as the energy is being used to do an activity, basically energy associated with the motion of objects in the universe.
  • The formula used to find the kinetic energy of an object is k = \frac{1}{2} mv^{2} where as k represented as kinetic energy, m is the mass of the object and v is the velocity of the given object.
  • Here, to find the answer we have to re-write the equation as v = \sqrt[2]{\frac{2 k}{m} }
  • Given, the mass of the object, here it is John = 80 kg, energy needs to be converted to kinetic energy, k = 1000  J.
  • Hence, substitute all the values, then you would velocity as 5 m/s

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a ) The speed of the cab just before it hits the spring = 7.4 m / s

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1 / 2 m vo² + m g hi = 1 / 2 m v² + m g h + f d

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b ) The maximum distance x that the spring is compressed,

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( 1/2 * 1800 * 7.4² ) + ( 1800 * 9.8 * x ) =0 + 0+ ( 4400 * x ) + ( 1/2 * 1800 * x² )

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b ) The maximum distance x that the spring is compressed = 0.9 m

c ) The distance that the cab will bounce back up the shaft = 2.8 m

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