A bullet fired into a fixed target loses half of its velocity after penetrating 3 cm. How much further it will penetrate before coming to rest assuming that it faces constant resistance to motion?
A
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B
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C
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D
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Solution
The correct option is B Let initial velocity of the bullet = u After penetrating 3 cm its velocity becomes u2 From v2=u2−2as (u2)2=u2−2a(3)
⇒6a=3u24⇒a=u28 Let further it will penetrate through distance x and stops at point C. For distance BC, v=0,u=u2,s=x,a=u28 From v2=u2−2as⇒0=(u2)2−2(u28).x⇒x=1cm.