Question

A car is traveling at a speed of 75 km/h. compute the speed of the car in m/s.

a. 5.6 m/s
b. 12.5 m/s
c. 20.8 m/s
d. 208.3 m/s

Answer 1

For this case we must apply the following conversion factors:

`1km = 1000m\\1h = 3600s`

We then have the following speed:

`75 \frac {km} {h}`

Applying the conversion factors we have:

`75 \frac {km} {h} 1000 \frac {m} {km} \frac {1} {3600} \frac {h} {s}`

Rewriting we have:

`20.8 \frac {m} {s}`

Answer:

The speed of the car in m / s is:

`20.8 \frac {m} {s}`

Answer 2

1 km = 1000 m
1 h = 3600 s

75 km/h
75 *1000 m / 3600 s
75 * 5 m / 18 s
25 * 5 m / 6 s
125 m / 6 s
20.8 m/s

answer is c.