PH-1690

Acceleration

Physics · Secondary 4 · Hard · Acceleration

A bullet of mass 0.020 kg enters a wooden block at 250 m/s and comes to rest after travelling 0.10 m inside it. Assuming uniform deceleration, how long does it take for the bullet to stop?

$8.0\times10^{-4}\,\text{s}$
$3.2\times10^{-4}\,\text{s}$
$4.0\times10^{-3}\,\text{s}$
$8.0\times10^{-3}\,\text{s}$

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