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Questions  >>  JEEMAIN and NEET  >>  Physics  >>  Class11  >>  Thermodynamics
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Q)

Two balls of equal masses moving with $\;10 \;ms^{-1}\;$ towards each other collide after some time . Considering the collision to be inelastic & mass of each ball to be 1 kg , the thermal energy developed in the process is equal to what?

$(a)\;10\;J\qquad(b)\;5\;J\qquad(c)\;100\;J\qquad(d)\;50\;J$

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A)
Answer : (c) $\;100\;J$
Explanation :
Since its an inelastic collision , the velocities reduce to zero
So , the thermal energy developed = kinetic energy lost
$=2 \times \large\frac{1}{2} $$\times 1 \times 10^{2}$$=100 J$
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