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ada15

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An object has a mass of M ... it explodes up into two pieces.. one piece has a mass of M/3 and the other piece has a mass of 2M/3.

1. which object has larger l momentum l ? ... both have same

2. which object has larger speed ? ... smaller mass has larger speed

3. which object has larger kinetic energy ? ... smaller mass has larger KE

4. Is mechanical enrgy conserved ? ... No

I understood the part (ii) and (iii) ... but i am not getting that why they same momentum ? why is mechanical energy not conserved ?

please help me .

Thanks