The impact force of a car traveling at 20m/s when it collides with an object will depend on a variety of factors, including the mass and speed of the vehicle, the angle of the collision, and the nature of the object it collides with. However, in general, the impact force can be quite high, potentially causing significant damage to both the vehicle and any objects or people it collides with. It is therefore important for drivers to take all necessary precautions to avoid collisions whenever possible.