A ball of mass m is thrown at an angle of 45º to the horizontal from top of a 65m high tower AB as shown in figure. Another identical ball is thrown with velocity 20 ms –1 horizontally towards AB from top of a 30 m high tower CD one second after the projection of first ball. Both the balls move in same vertical plane. If they collide in mid air, then calculate distance AC. (Given, g = 10 ms –2 ) 
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Sol. 40 m
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