Question

A 100 g Plastic block moving at 4 m/s, what is the kinetic energy?

Answer 1

$\huge{\underline{\underline{\red{\bf{Answer}}}}}$

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Given:

• Mass (m) = 100g = 0.1 kg
• Velocity (v) = 4 m/s

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To find:

• Kinetic energy

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Solution:

• We have mass and velocity of an object.

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$\setlength{\unitlength}{1cm}\begin{picture}(5,5)\put(1,1){\framebox(1,1){\sf{100 g}}}\put(2,1.5){\vector(1,0){2.1}}\put(4.4,1.4){\bf{4 m/s}}\put(0.5,1){\line(1,0){4.5}}\multiput(0.6,1)(0.22,0){20}{\qbezier(0,0)(-0.1,-0.1)(-0.2,-0.2)}\end{picture}$

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Now, the kinetic energy of a body is half the product of the mass of the body and square of the velocity of the body.

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$\huge{\dag{\mid{\pink{\bf{K.E = \dfrac{1}{2}mv^2}}}}}{\mid{\dag}}$

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$\tt:\implies{K.E = \dfrac{1}{2} \times 0.1 \times (4)^2}$

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$\tt:\implies{K.E = \dfrac{1}{\cancel{2}} \times 0.1 \times \cancel{16}}$

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$\tt:\implies{K.E = 0.1 \times 8}$

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$\frak:\implies{\purple{K.E = 0.8}}$

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Hence,

• Kinetic energy is 0.8 Joule.

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