Chem1, Charlotte is driving at 66.5mi/hr and receives a text message. She looks down at her phone and takes her eyes off the road for 3.47s. How far has Charlotte traveled in feet during this time?

Question

Charlotte is driving at 66.5mi/hr and receives a text message. She looks down at her phone and takes her eyes off the road for 3.47s. How far has Charlotte traveled in feet during this time?

distance=...................................ft

Answer 1

This question is more of a physics problem dealing with the equations of motion.

The key in this type of problem is determining what quantities are known and which need to be determined.

In this case, we have initial speed given, final speed needing to be zero and a distance covered in a given time.

First convert miles an hour to feet per second (remember 1 mile = 5760 feet and 1hour = 3600 seconds). Assuming constant braking force (deceleration) we can use the equation of motion.

s = 0.5 (u + v) t = 0.5(66.5 times 5760/3600)3.47 = 184.604 feet should rounded to 1 decimal place.