Question 1 (1.1) A stone is projected forward from a car which is moving backwards at a speed relative to the ground. The stone is projected at a speed y, relative to the car, at an angle a to the horizontal. (1.1a) Neglecting air friction and the height of the car (the latter implies that the stone is projected from the ground level), calculate the distance D between the point where the stone was projected and the point where it lands. (1.1b) Determine in which case D-0, and explain what this means physically.

Question 1 (1.1) A stone is projected forward from a car which is moving backwards at a speed relative to the ground. The stone is projected at a speed y, relative to the car, at an angle a to the horizontal. (1.1a) Neglecting air friction and the height of the car (the latter implies that the stone is projected from the ground level), calculate the distance D between the point where the stone was projected and the point where it lands. (1.1b) Determine in which case D-0, and explain what this means physically.