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CBSE Class 10 Answered

A man short a bullet with a speed of 10 m/s which just penetrates a plank of wood . With what speed should he shoot a bullet to pass through 10 similar planks.
Asked by acv27joy | 12 May, 2018, 08:43: PM
answered-by-expert Expert Answer
Retardation a provided by the plank is evaluated as below
 
u2 = 2×a×S ; u is the initial speed and S is the thickness of plank.
 
hence retardation is given by;  a = 100/(2×S) = 50/S ............(1)
 
Speed required to shoot ten planks :  u2 = 2×(50/S)×(10×S)
 
we get u = 10×√(10) m/s = 31.6 m/s
Answered by Thiyagarajan K | 13 May, 2018, 12:41: PM

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