Aircraft B has a constant speed of 540 km/h at the bottom of a circular loop of 400-m ra...

Aircraft B has a constant speed of 540 km/h at the bottom of a circular loop of 400-m radius. Aircraft A flying horizontally in the plane of the loop passes 100 m directly under B at a constant speed of 360 km/h .With coordinate axes attached to B as shown, determine the acceleration which A appears to have to the pilot of B for this instant.