a car is moving at a constant 88 km/h when a dog suddenly appears on the road ahead. The driver immediately brakes to avoid hitting the dog.If the reaction time of the driver is 0.2 s how far has the car moved bt the time the driver touches the pedal?
2006-12-17 14:10:05 · 5 answers · asked by Anonymous in Education & Reference ➔ Homework Help
88 km = 88000 m and 1 hr = 60 min = (60)(60) sec = 3600 sec, so 88 km/hr = 88000/3600 m/sec = 24.4 m/sec. Then in 0.2 seconds the car travels (24.4)(.2) meters = 4.88 meters
2006-12-17 14:21:47 · answer #1 · answered by wild_turkey_willie 5 · 0⤊ 1⤋
Change that 88 km/hour in to .02 km/sec. I just took 88 and divided it by sixty twice. (Another way is to divide 88 by 3600, which is 60 times 60)
See, when I divide by sixty the first time, I'm dividing the hour by sixty as well. Therefore, it becomes a minute. If I do that again, The minites divides into a second.
This makes the question all the easier. If .02 km is in one second, and the driver goes for 2 seconds, you take .02 and multiplty that by 2. (2 representing the 2 seconds). your final answer is .04 km.
Don't forget to show your work!!
2006-12-17 22:33:55 · answer #2 · answered by Lord_French_Fry 3 · 0⤊ 1⤋
=88 km = 88000 m
= 1 hr = 60 min
= (60)(60) sec = 3600 sec
so 88 km/hr = 88000/3600 m/sec
= 24.4 m/sec.
So in 0.2 seconds the car travels
(24.4)(.2) meters = 4.88 meters
4.88 meters 4.88 meters 4.88 meters 4.88 meters
THE ANSWER IS ===========>
4.88 meters 4.88 meters 4.88 meters 4.88 meters
2006-12-17 22:47:07 · answer #3 · answered by yhp 2 · 1⤊ 0⤋
88km/hour =88,000m/3600seconds = 2.444m/sec
So in 0.2 seconds the car would travel .2*2.444 = 0.4888 meters
2006-12-17 22:17:43 · answer #4 · answered by ironduke8159 7 · 1⤊ 0⤋
I think this has something to do with momentum and velocity. Try looking at the formulae for those and see what you can come up with.
2006-12-17 22:16:23 · answer #5 · answered by Symphonia 2 · 0⤊ 1⤋