Physics

Question

A 1000-kg car has 50,000 joules of kinetic energy. What is the speed?

2 Answer

  • K.E = 1/2mv^2

    The kinetic energy is 50,000 J and the mass of the car is 10,000 kg. 

    50,000 J = 1/2(10,000kg)v^2
    Solve for v (velocity) 
    50,000 J = 5,000 kg x v^2
    10 = v^2
    [tex] \sqrt{10} = v[/tex]
    about 3 m/s (in terms of significant figures) 
  • Answer:

    ½mv²= KE  

    ½(1000)?²= 50000

    500*?²= 50000

    500          500

    ? ²=100

    Square root  

    ?= 10

    10 m/s is you answer

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