Question: An arrow with rest length Let is fired towards a box of length 4 / , er / 5 that has doors which can be

An arrow with rest length Let is fired towards a box of length

4 /,

/ 5

that has doors which can be opened and closed instantaneously. What minimum speed v must the arrow travel with relative to the box for both doors to close and contain the arrow at the instant it passes through the box?A

. 0.8

. 0.7

. 0.6

. 0.5

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