Physicshard · Past Paper
A bullet of mass m hits a target and its velocity becomes half after penetrating a distance x. How much further will it penetrate before coming to rest?
Ax
Bx/2
Cx/3
D2x
✓ Correct Answer: C — x/3
KE change 1 (to v/2) = 3/4 initial KE over distance x. Remaining 1/4 KE will be lost over x/3 distance (since force is constant).
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