NEET 2009 Physics question
An explosion blows a rock into three parts. Two parts go off at right angles to each other. These two are, first part moving with a velocity of and second part moving with a velocity of . If the third part flies off with a velocity of , its mass would be:
Answer: (4)
Solution
The rock was initially at rest, so the total momentum after the explosion is zero (conservation of linear momentum): the vector sum of the three momenta is zero. and $ = 2×8 =
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