A car was traveling at 75km/minute northwest on a wet street when the driver spotted a wreck ahead. The driver hit his brakes and started to slow down. It took him .07 minutes before coming to a complete stop. What is the velocity of the car? How far did the driver travel before he stopped?
2007-05-08 14:39:59 · 2 answers · asked by random and unique 4 in Science & Mathematics ➔ Physics
The car was travelling at 75 x 60 kmph.
It took him 4.2 seconds to slow down.
Using that information you should be able to work out the answer.
I do not supply instant answers, but the guidelines as to how to work out the answer.
2007-05-09 07:22:35 · answer #1 · answered by Harry Hayfield 6 · 0⤊ 0⤋
What is the velocity of the car? Hmmm, 75km/minute before starting to stop, zero after it stopped. (Incidentally that's really going fast. 75 km/hour is more normal for a car.)
How far did the driver travel?
x = (1/2)*(Vo + Vf)*t
where Vo is the original velocity, Vf is the final velocity, and t is the time it took to change speed from Vo to Vf. What this equation does is calculate the average speed and multiply by time.
2007-05-08 16:00:49 · answer #2 · answered by sojsail 7 · 0⤊ 0⤋