Physics question problem!?

Question

At highway speeds, a particular automobile is capable of an acceleration of about 1.6 m/s(squared). At this rate, how long does it take to accelerate from 80 km/h to 110 km/h?

help me out!!

Answer 1

first you have to convert your two velocitites (80 and 110)

80km/h=1000m over 1km X 60 min over 1 hour X 60 sec over 1 min

so solve this so that you have  30 X 1000 X 60 X 60

solve thatto get your conversion

do the same thing using 110

next use this physics equation. v=vinitial + a*t

v= velocity (m/s)

vinitial= initial velocity (m/s)

a=accerlation (m/s^2)

t= time (s)

your initial velocity is 80 km/h (or whatever you converted it to)

your velocity is 110km/h (or w/e you converted it to)

your acccelration is 1.6m/s^2

and time is what your solving for

so you will end up with this

110km/h(USE WHAT U CONVERTED)=80km/h(DITTO) + 1.6m/s^2*t

solve this like an algebra equation

30km/h=1.6m/s^2 * t

(30km/h)/(1.6m/s^2)=t

rememeber convert!!!!!!!!

hope this helps! anymore questions just tell me on one of my questions! i just took physics so i know a lot more!!!

good luck!

Answer 2

1 km/h = 0.277778 m/s (1000 / 60 / 60)

80 km/h = 22.22 m/s

110 km/h = 30.56 m/s

So, the increase in speed is 30.56 - 22.22 = 8.34 m/s

Acceleration is 1.6 m/s per second

At this rate it takes 8.34 / 1.6 = 5.21 seconds

Answer 3

V1=80'000/3600=22.22m/sec,V2=30.55 m/sec

Delta V=30.55-22.22=8.33 m/sec =1.6XT,then T=5.21seconds.