In corring to a stop a car leaves skid marks 75 in on the hi
     In corring to a stop, a car leaves skid  marks 75 in on the highway. Assuming a deceleration of 4.30 m/s^2,estimate the speed of the car just before braking. Express your answer using two significant figures.   
  
  Solution
Use the kinematic equation to find the speed.
     v\'^2 =v^2 + 2as
 0 = v^2 + 2(-4.3)(75)
therefore, the speed is,
       v = 25.4 m/s

