2 blocks of masses 10 kg and 20 kg moving at speeds of 10m/sec and 20m/sec resp. in oppsite directions collide.If the collision is completly inelastic,find the thermal energy developed in the process.

Dear Allina,

Ans;- 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/s

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

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