1. The speed of a car travelling on a straight horizantal road is v. What is the speed of point P on the tyre of the car? I consider the distance travelled by the car per revolution is same as the circumference of the tyre, while speed of point P, is equals to circumference divided by the time taken. If that so, the speed of the point P = v. But the answer given is 2v. What method should I use to determine speed of the point P? 2. An aircraft is flying in a horizantal circle of radius 80km at a constant speed of 300ms-1. What is the ratio of the lift on the aircraft to its weight? The angle is not given here. How should I calculate the lift?