Question

A car advertisement states that a certain car that Emily Miller love can accelerate from rest to 70km/h in 7 seconds. Fine the car's average accelerate

Answer 1

Average acceleration  =  (change in speed)  /  (time for the change)

                                       =           (70 km/hour)  /  (7 seconds)

                                       =               10  km/hr-sec .

That's a valid unit of acceleration ...  [ length / time² ] ...
but it's so clunky that we can't relate to it.  We usually
want to see acceleration in  m/s² .  So I'll convert this
answer to the more conventional unit.

                 (10 km/hr-sec) · (1,000 m / 1 km) · (1 hr / 3,600 sec)

             =  (10 · 1,000 · 1) / (1 · 3,600)  m/s²

             =          2.78  m/s²        ( about  0.28 G )