Two food packets are thrown with same velocity in the same direction with different angles of projection simultaneously. The angle of projection of one packet is 15°. At the same moment one boy starts running from rest from the point of projection with an acceleration of 10 ms^{-2} to catch them. If he caught one packet at a distance of 20 m and other packet in 1/2 s later the first packet, then the angle of projection of the second packet is (Acceleration due to gravity = 10 ms^{-2})