Trouble with this one: BIO Surviving a Large Deceleration On July 13,1977, while

Question

Trouble with this one:

BIO Surviving a Large Deceleration On July 13,1977, while on a test drive at Britain's Silverstone racetrack, the throttle on David Purley's car stuck wide open. The resulting crash subjected Purley to the greatest g-force ever survived by a human?he decelerated from 173 km/h to zero in a distance of only about 0.66 in. Calculate the magnitude of the acceleration experienced by Purley (assuming it to be constant) and express your answer in units of the acceleration of gravity, g = 9.81 m/s^2.

Explanation / Answer

intial velocity u= 173 km/hr = 48.056 m/s

final velocity v = 0

from

v2 = u2 -2as , where a is deaceleration

so 48.0562 = 2a*0.66

a = 1749.53 m/s2

a = 178.34 g , where g is acceleration due to gravity

the magnitude of the acceleration experienced by Purley is 178.34 g

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