Asked by douglas
If a car can go from 0 to 60mi/hr in 8.0 seconds, what would be its final speed after 5.0 seconds if its starting speed were 50mi/hr? My answer was -10, is this correct. If not , I need help
Answers
Answered by
Steve
How ever did you get a negative number? I'd assume we are using the same positive acceleration, starting from 50 mph!
assuming constant acceleration, then since the velocity changed by 88ft/s in 8 seconds,
a = 11 ft/s^2
Now to find v, just recall that
v(t) = Vo + at
Just plug in your numbers. I guarantee you will not wind up with -10.
Of course, in the real world, acceleration from a standing start is very different from a starting speed of 50 mph!
assuming constant acceleration, then since the velocity changed by 88ft/s in 8 seconds,
a = 11 ft/s^2
Now to find v, just recall that
v(t) = Vo + at
Just plug in your numbers. I guarantee you will not wind up with -10.
Of course, in the real world, acceleration from a standing start is very different from a starting speed of 50 mph!
Answered by
taylor
oops, didn't find acceleration first(7.5), which is 60 /8. Then 7.5 x 5 + 50=87.5,
a*t+v(starting speed)=final speed
a*t+v(starting speed)=final speed
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