- #1
Crusaderking1
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Homework Statement
An advertisement claims that a particular automobile can "stop on a dime". What net force would actually be necessary to stop an automobile of mass 850 kg traveling initially at a speed of 51.0 km/h in a distance equal to the diameter of a dime, which is 1.8 cm? Answer must be in two sig. figs.
Homework Equations
V² = u² + 2 a*s
F(net) = m*a
The Attempt at a Solution
51 km/h = 14.16 m/s
0= (14.16)^2 + 2a(0.018)
a= 200.5 / -0.036
a= -5,569.4 m/s^2
850 kg * -5569.4 = Fnet
Fnet = 4,734,027.78 N
(this is 2 sig figs right)?
Did I do this right? If I did, why exactly do I receive -0.036?(I just multiply 0.018 but I don't really understand why.)
Thanks.