Why is the ,g, negative and why is it divided by theacceleration and not the pro

Question

Why is the ,g, negative and why is it divided by theacceleration and not the product of acceleration. A world's land speed record was set by Colonel John P. Stappwhen in March 1954 he rode a rocket-propelled sled that moved alonga track at 1020km/h. he and the sled were brought to a stop in1.4s. in terms of g, what acceleration did he experiance. Why is the ,g, negative and why is it divided by theacceleration and not the product of acceleration. A world's land speed record was set by Colonel John P. Stappwhen in March 1954 he rode a rocket-propelled sled that moved alonga track at 1020km/h. he and the sled were brought to a stop in1.4s. in terms of g, what acceleration did he experiance.

Explanation / Answer

initial velocity v = 1020 km/h = 1020/3.6 m/s (here v is positive,it means we choose its direction is positive) final velocity v' = 0 time t = 1.4 s find a a = (v' - v)/t = -202.4 m/s2 (it is negative, means thedirection is opposite to that of the initial velocity) a = -20.7 * (9.8 m/s2) = -20.7 g

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