Work Energy and Power - Result Question 51
54. 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 1 $kg$ moves with a speed of $12 ms^{-1}$ and the second part of mass $2 kg$ moves with speed $8 ms^{-}$ ${ }^{1}$. If the third part flies off with speed $4 ms^{-1}$ then its mass is
[2013]
(a) $5 kg$
(b) $7 kg$
(c) $17 kg$
(d) $3 kg$
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Answer:
Correct Answer: 54. (a)
Solution:
- (a)
$ =m v^{2}+\frac{m v^{2}}{2}=\frac{3}{2} m v^{2} $
