That's why they wear helmets

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lexw

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http://mcatquestionoftheday.com/physics/thats-why-they-wear-helmets/

A human skull can withstand 100 kPa before fracturing. A baseball, with an impact area 0.003 m2 and a weight of 0.15 kg, is launched from a pitching machine, a distance of 20 meters, towards a skull. How long would it take for the baseball to travel if the skull was cracked?
  • A. sqrt (1/50) s
  • B. sqrt (50) s
  • C. sqrt (2000) s
  • D. sqrt (50,000) s
their explanation makes sense, but i was trying to solve it all in one go by subbing a = d/t^2 into P=F/A where F=ma. theoretically it should make sense right?

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