Q. An explosion breaks a rock into three parts in a horizontal plane. Tw...

Q. An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1kg moves with a speed of 12ms−1 and the second part of mass 2kg moves with 8ms−1 speed. If the third part files off with 4ms−1 speed, then its mass is :

Neet 2013 nlm & frctn q 3 till now you must have seen two hints videos related to this problem 

where i told you that first thing we will need is its diagram according to info given and required 

assumption, second thing is to apply momentum conservation . Finally we have to write 

momentum of each individual particles , even for the third particle while keeping in mind that only 

its speed is given , not its velocity. So we need to take modulus on both sides and velocity of third 

particle will automatically converted to speed i.e given data.

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