Question

A car's displacement is 42 km [S] after driving for .75 hours. What is the car's average velocity in km/h and m/s?

Answer 1

`a. =(56km)/(hr)`
`b. ~~(16m)/(sec)`

Explanation:

Given the data, the average velocity can be computed as follows:

`v=d/t`

where:

`v="velocity"`
`d="distance"`
`t="time"`

`a. "in km/hr"`
`v=d/t`
`v=(42km)/(0.75hr)`
`v=(56km)/(hr)`

`b. "in km/sec"`
`v=d/t`
`v=(42cancel(km))/(0.75cancel(hr))xx(1000m)/(1cancel(km))xx(1cancel(hr))/(60cancel(min))xx(1cancel(min))/(60sec)`
`~~(16m)/sec`

Take note of the following equivalence statements:

`1hr=60 min`
`1min=60 sec`
`1km=1000m`