How many g's?

Question

A particular race car can cover a quarter mile in 6.8 seconds, starting from a standstill. If acceleration is constant how many g's does the driver experience? If the combinded mass of the driver and race car is 455 kg what is the horizontal force exerted on the tires? in N

Answer 1

S=(1/2) at^2
a= 2S/t^2
we know that 1 mile = 1,609 meters
number of g= a/g= 2S/(gt^2)=
#g=2(1/4)(1,609 )/(9.81x (6.8)^2)=1.77g

F=ma
so
F= 455 x 1.77 x 9.81=7,900N

Answer 2

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