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Question

Calculate the kinetic energy of a body of mass $$10 kg$$ moving with a velocity $$2m{ s }^{ -1 }$$.


A
40J
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B
20J
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C
30J
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D
10J
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Solution

The correct option is B $$20 J$$
Mass = 10kg, Velocity = 2m/s
K.E = $$\dfrac{1}{2}$$mv$$^{2}$$
           
       = $$\dfrac{1}{2}$$ $$\ast$$ 10 $$\ast$$ 2$$^{2}$$
          
        = 20J

Physics

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