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Please help me understand velocity and acceleration..?
Ive been reading the notes for my physics class about acceleration and velocity and im quite confused.
Example
Two cars are moving in the same direction in parallel lanes along a highway. At some instant, the velocity of car A exceeds the velocity of car B. Does that mean that the acceleration of A is greater than that of B at that instant?
That was a question and the answer is no. I dont understand because the cars are traveling the same direction, and they have the the same velocity except for at that one instant, so they would never pass each other unless one experienced positive acceleration or the other experienced negative acceleration, because if they were traveling at a constant velocity there would be no acceleration. So how is it that one cars velocity (displacement/time) can increase without the acceleration changing in a parallel line? I could understand the change if at that instant one car was slightly turning while the other one was going straight... please help me understand...thanks
exactly it says "at some instant..." meaning that the velocity was the same at other times. They wouldnt say that if the velocity was different at every instant. This is why i don't understand the question.
2 Answers
- ?Lv 510 years agoFavorite Answer
This is kind of a trick question because they are having you look at only that instant, which makes it easy to assume that they both have the same velocity at other times, and that there is any acceleration at all. If both the cars are moving at constant but different velocities, then the velocity of A would exceed that of B at any instant of time.
- casselmanLv 45 years ago
in case you shuttle at an preliminary velocity of five mile in line with sec and advance up at 5 mile / sec / sec for 5 sec, then what's your velocity after the 5 seconds? Your automobile quickens from 0 to 60 miles in line with hour after 5 seconds, at a relentless value. what's the acceleration?
