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14-12-2021
Physics

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A bullet of mass 20 g has its kinetic energy equal to 400 J. Find the speed of the bullet.

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14-12-2021

Answer:

m=20g=0.02kg
K.E=400J

[tex]\\ \sf\longmapsto KE=\dfrac{1}{2}mv^2[/tex]

[tex]\\ \sf\longmapsto \dfrac{1}{2}(0.02)v^2=400[/tex]

[tex]\\ \sf\longmapsto 0.01v^2=400[/tex]

[tex]\\ \sf\longmapsto v^2=40000[/tex]

[tex]\\ \sf\longmapsto v=200m/s[/tex]

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