What is the advantage of having two eyes instead of one eye in humans? 1. helps in estimating the distance of the object that they see
2. helps to see a wider area and hence more objects
3. helps to see objects that are at a great distance

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?