Problem 29P

(a) In the previous problem, the car’s speed decreased by 7.0 m/s as it coasted across a sandy section of road 32 m long. If the sandy portion of the road had been only 16 m long, would the car’s speed have decreased by 3.5 m/s, more than 3.5 m/s, or less than 3.5 m/s? Explain. (b) Calculate the change in speed in this case.

Solution 29P

Step 1 of 4

In the previous problem, the speed decreased by 7 m/s.

If the length of the sandy road would be 16 meters instead of 32 meters, then how it will affect the final speed that we need to find here.

Let’s assume that the car start with the same initial speed of 19 m/s.

The force must be same for both the cases.

The force we have found in the previous question is: .