Question

Question #bed07

Answer 1

3.67 seconds.

Explanation:

First we need to convert those speeds to m/s.

`55 "miles"/h * (1609 m)/(1 "mile") * (1 h)/(3600 s) = 24.6 m/s`

`60 "miles"/h * (1609 m)/(1 "mile") * (1 h)/(3600 s) = 26.8 m/s`

Right 0.6`ms^-1` faster every second right. that's what acceleration is the change in velocity over a period of time or `a = (DeltaV)/t`

We know a which is 0.60`ms^-2`
So rearrange `a = (DeltaV)/t` for time,

`t = (DeltaV)/a` or
`t = ((26.8-24.6) m/s) /(0.6 m/s^2)` which = 3.67s