Physicshard · Past Paper
A bullet fired into a fixed target loses half of its velocity after penetrating 3 cm. How much further will it penetrate before coming to rest?
A1 cm
B1.5 cm
C2 cm
D3 cm
✓ Correct Answer: A — 1 cm
v^2 = u^2 + 2as. (u/2)^2 = u^2 + 2a(3). Find 'a'. Then 0 = (u/2)^2 + 2a(x). x = 1 cm.
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