Are we still doing sinkholes?
"They've built a road on to the Banna park near the disturbance by the try-line, and after digging out a large section at the Brynmawr end have begun to fill it in with more than 2,000 tons of spark-proof stone. When the workers from the coal board saw how deep it went at over 70m their jaws just dropped and so did ours."
Is there a "lost ball" rule in rugby?
Male Talkers
2 hours ago
4 comments:
Yes we are: sinkholes, cow attacks and cars hitting houses are staple fare of this blog.
70m deep = a stone would take nearly 4 seconds before it hits the bottom.
Terminal velocity = 4 secs x 9.8 m/s2 = 39 m/s
Average speed = half terminal velocity = 19 m/s
70m ÷ 19 m/s = about 4 seconds.
I like the bit about "spark-proof stone". Imagine if they'd got that wrong...
Dai another day, perhaps?
I’ll get my coat...
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