A car skidded m ft during a race. The expression s =  is the rate of speed of the car in ft/s. Find the rate of the speed of the car, if the car skidded 196 ft.

The correct answer is:

The expression of speed is s = √(5m) ft/s. We have to fins the speed when the car skidded 196m.
We have, 
s = √(5m)
=> s = √(5 × 196)
=> s = 14√5 ft/s.
Hence, the correct option is B.

 A radical expression is an expression containing a square root.