physics
posted by Justin on .
A 1300kg car rolling on a horizontal surface has speed v = 65 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.3 m.
What is the spring stiffness constant of the spring?

1/2 mv^2=1/2 k x^2
change v to m/s then solve for k 
1023.04 N/M

i put 1023.04 as the answer and it said it was wrong

try using the correct sigfigs?

and ur answer is wrong neway
m=1300
v~18
x=2.3
now solve 
79622?

1.8*10^4