posted by Ronnie .
How long in seconds does it take for a car accelerating at 3.5m/s2 to go from rest to 120km/hr
First you need to convert the final speed to meters per second. I assume you know how to do that.
Vfinal = 120 km/h = 33.33 m/s
The acceleration rate is a = 3.5 m/s^2
Time required = Vfinal/a = 33.33/3.5
= 9.5 seconds.