physics
posted by Shan on .
Determine the stopping distances for an automobile going a constant initial speed of 97km/h and human reaction time of 0.50s , for an acceleration a=−6.5m/s2

***Convert initial speed to m/s
a=6.5m/s^2
Vf=0
d=?
***Vi=97km/h*(10^3m/1km)*(1h/3600s)=27m/s
Use the following equation and solve for d:
Vf^2=Vi^2+2ad
0^2=(27m/s)^2+2(6.5m/s^2)d
729=13d
Solving for d,
729/13=d
d=56m 
correct.

wrong

devron you suck