Question

During a recent trip to the store, a car's velocity went from 0 to 60 mph in 20 seconds. What is the average acceleration of the car in mile per hour per hour

Answer 1

id assume it to be the slope of the line created by the points (0,0) and (20,60)

Answer 2

lol ... they appear to have a censoring database up and working

Answer 3

Ages since I did these, is that per hour or per minute?

Answer 4

i converted the given time to hours. so it is per hour

Answer 5

At least I get the 0 to 60 part,lol

Answer 6

U have 20 seconds/60

Answer 7

= 1/3 hour.

Answer 8

yes correct...

Answer 9

Ah mph....

Answer 10

Yes, I remember now, have to check dimensions...

Answer 11

NOOOOOOO !! i made a boo-boo

it has to be divided by 3600 to convert to hour !!!

Answer 12

Ah, I wasn't imagining things then..

Answer 13

10,800, right'

Answer 14

Average acceleration is the rate at which velocity changes. Average acceleration is the change in velocity divided by an elapsed time.

change in velocity = 60 mph - 0mph = 60 mph
time taken for this change = 20 seconds = 20/3600 h = 1/180 h

60 180
average acceleration = ------ mph^-2 = 60 * ---- = 10800 mph^-2
1/180 1

That's WOW acceleration.......

Answer 15

Did the driver survive this acceleration???????
How did the car achieve this acceleration???

Answer 16

Yes, I guess as a rate it goes up a lot over an hour.

Answer 17

I think not feasible for an hour...

Answer 18

....☺

Answer 19

Oh well, we gave him an answer, anyway...

Answer 20

yeah, true......

Answer 21

u deserve a medal for pointing out the error in my calculation....

Answer 22

Thanks
I have to do some reading up on these things, I used to quite like mechanics/physics things, but years ago...

Answer 23

yeah, it is an interesting area to look into...........