A cart is moved horizontally with a constant velocity of 4 m/sec. A ball is thrown from it with a velocity of 4 m/sec and at an angle θ with the horizontal with respect to the cart. Assume the height of the cart is very small, so that the motion of the ball is assumed to be a ground-to-ground projectile. Horizontal range of the ball with respect to the ground is R1 and that with respect to the cart is R2. Then