Two towers AB and CD are situated at distance d apart as shown in Fig. AB is 20 m high and CD is 30m high from the ground. An object of mass m is thrown from the top of AB horizontally with a velocity of 10 m/s towards CD. Simultaneously, another object of mass 2m is thrown from the lay of CD at an angle 60 to the horizontal towards AB with the same magnitude of initial velocity us that of the first object. The two objects move in the same vertical plane, collide in mid-air, and stick to each other. a. Calculate the distance d between the towers. b. Find the position where the objects hit the ground.