Two identical balls each of mass 2 kg. are moving towards each other with the same speed of $5 m / s$ . They collide with each other, stick together and come to rest what is the work done by the internal forces-

5 J

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10 J

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25 J

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50 J

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Solution

The correct option is B 50 J
W.D by internal forces $= Δ K E = 2 (\frac{1}{2} m v^{2} - 0)$
$= 2 (\frac{1}{2} \times 2 \times 25 - 0) = 50 J$

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Two identical balls each of mass 2 kg. are moving towards each other with the same speed of 5m/s. They collide with each other, stick together and come to rest what is the work done by the internal forces-

The correct option is B 50 JW.D by internal forces =ΔKE=2(12mv2−0)=2(12×2×25−0)=50J

Two identical balls each of mass 2 kg. are moving towards each other with the same speed of $5 m / s$ . They collide with each other, stick together and come to rest what is the work done by the internal forces-

The correct option is B 50 J
W.D by internal forces $= Δ K E = 2 (\frac{1}{2} m v^{2} - 0)$
$= 2 (\frac{1}{2} \times 2 \times 25 - 0) = 50 J$