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The final velocity of the combination is v (let) towards the initial direction of the 20 kg body Hence the Eq of the conservation of momentum is
(20*20)-(10*10)= 30v
Hence v=10m/z
From the conservation of the total energy we get,
1/2(20*20²+10*10²)=H+1/2(30*10²)
Solving we get H=2000 J
=2 kJ
Regards
Arun (askIITians forum expert)
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