Posted by **Sam** on Tuesday, February 3, 2009 at 10:39pm.

a car attempts to stop and slides 25.5m while accelerating at -4m/s^2. The car's initial velocity was 20m/s. Find the time the slide took. Note that the final velocity is not known and that you need a quadratic solution.

I know the quadratic formula, but I'm not sure how to plud in the values; could sombody please calrify. Thank you in advance. :)

- Physics - please, I really need help -
**bobpursley**, Tuesday, February 3, 2009 at 10:51pm
Vf^2=Vi^2 +2a* disance

find Vfinal first. You have Vi, a, distance. Remember a is negative.

Now, knowing Vf.

Vf=Vi+ a*time

Now find time.

YOu do not need the quadratic formula.

## Answer this Question

## Related Questions

- Physics - Important - a car attempts to stop and slides 25.5m while accelerating...
- physics - A 1000 kg car in neutral gear slow from 15 m/s to a stop in 5.0 s due ...
- PHYSICS - A car is moving in the +x direction with the following position ...
- Physics - A car is moving in the +x direction with the following position ...
- Physics - Givent the initial velocity of the car, the driver's reaction time, ...
- Physics - A 1300kg car going 20m/s has to stop suddenly. The driver locks the ...
- physics - A car travels a distance of 100m per second with a constant ...
- physics - A car travels a distance of 100m per second with a constant ...
- physics - A car travels a distance of 100m per second with a constant ...
- physics ( please help me) - a railroad handcar is moving along striaght, ...