Question 4612
Time=10 seconds
Rate of deacceleration=2 miles per 3 seconds

Original Speed=55 mph
Man hits brakes.
-----
After 3 seconds=>deacc = 2 mph
Speed=55-2=53 mph
-----
After another 3 seconds=>deacc = 2 mph
Speed=53-2=51 mph
-----
After another 3 seconds=>deacc = 2 mph
Speed=51-2=49 mph
-----
After 9 seconds,speed=49 mph
Last one second,deacc = 2/3 mph
Hence speed=
=49-2/3
=48.33 mph

------
<b>Ans: 48.33 mph</b>
xcentaur-at-hotmail-dot-com