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When a bullet is fired a target, its vel...

When a bullet is fired a target, its velocity dwecreases by half after penetrating 30 cm into it. The additional thickness it will penetrate before coming to rest is

A

30 cm

B

40 cm

C

10 cm

D

50 cm

Text Solution

Verified by Experts

The correct Answer is:
C
Retardation (a) `(((V)/(2))^(2) - v^(2))/(2S) = (-3v^(2))/(8 xx 0.3)`
`S. = (0-((V)/(2))^(2))/(2a) = (-v^(2))/(4) xx (1)/(2) xx (8 xx 0.3)/(-3v^(2))`
` = 0.1 = 10 cm`
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