A car is traveling down a one lane country road at 21 miles/hour. Up ahead a truck is traveling the opposite direction at 15 miles/hour. If they are 0.20 miles apart, how long will it be before they run into each other assuming neither one of them slows down?
2006-09-30 11:15:26 · 4 answers · asked by iluvhipos 3 in Science & Mathematics ➔ Physics
I'm not going to just give you the answer but I will help you understand how to find the answer. Assuming the speed is constant and the vehicles drive straight, you have two velocity vectors. You can figure the amount of time it takes for the velocity vectors (.2 miles apart) to intersect or you can also sum the vectors (36 miles per hour) and determine how long it will take to travel .2 miles at 36 miles/hour.
2006-09-30 11:26:13 · answer #1 · answered by ?man 2 · 0⤊ 0⤋
To solve this problem you need the two cars relative speed: 21+15=36 mph. To figure out the rest just divide .2 by 36 to get 20 seconds.
2006-09-30 18:26:23 · answer #2 · answered by bruinfan 7 · 0⤊ 0⤋
Question is how long will it take to cover .2 mi at 36mi/hr (the combined speed).
speed=36mi/hr/3600s/hr=.01mi/s
.2mi/.01mi/s=20s
2006-10-04 15:17:40 · answer #3 · answered by yupchagee 7 · 0⤊ 0⤋
They crashed not enough time to answer the question.
2006-09-30 18:19:01 · answer #4 · answered by jess g 3 · 0⤊ 0⤋