A) \[3v\cos \theta \]
B) \[2v\cos \theta \]
C) \[\frac{3}{2}v\cos \theta \]
D) \[\frac{\sqrt{3}}{2}v\cos \theta \]
Correct Answer: A
Solution :
Shell is fired with velocity v at an angle q with the horizontal. So its velocity at the highest point = horizontal component of velocity =\[v\cos \theta \] So momentum of shell before explosion = \[mv\cos \theta \] When it breaks into two equal pieces and one piece retrace its path to the canon, then other part move with velocity V. So momentum of two pieces after explosion \[=\frac{m}{2}(-v\cos \theta )+\frac{m}{2}V\] By the law of conservation of momentum \[mv\cos \theta =\frac{-m}{2}v\cos \theta +\frac{m}{2}V\]Þ \[V=3v\cos \theta \]You need to login to perform this action.
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