A car advertisement claims that a certain car can accelerate from rest to 70 km/hr in 7 seconds find the car acceleration

Question

asked Feb 16, 2021 205k views

1 Answer

Stan Riley · Answer 1 · 2021-02-19T23:05:13+0000

Answer:

acceleration
$\approx 2.78\,\,(m)/(s^2)$

Explanation:

The acceleration is the change in velocity per unit of time.

Therefore to have this rate in appropriate units that can combine, we re-write the change from 0 to 70 km/h in meters per second using:

70 (km)/(h) = (70000)/(3600) (m)/(s)

so in this case the acceleration becomes:

$accel=(change\,\,vel)/(change\,\,time) =(70000m)/(3600\,*7\,s^2) \approx 2.78\,\,(m)/(s^2)$