suddenly
it explodes and one of its partof 18 kg comes to rest while the remaining part
flies off. Find the velocity of the latter.
Answer:
Here, mass of shell = 30 kg
Initial velocity of shell 
Total initial momentum 
On exploding, mass of one part =
18 kg,
Hence, mass of other part = 30
-18 = 12kg (1)
The first part comes to rest,
i.e.,
Let the velocity of other part 
Then total final momentum 
(1)
Applying law of conservation of
momentum, we have
Total final momentum = Total
initial momentum
(1)
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