1 A small ball \(B\) is projected with speed \(38 \mathrm {~m} \mathrm {~s} ^ { - 1 }\) at an angle of \(30 ^ { \circ }\) to the horizontal from a point on horizontal ground. Find the speed of \(B\) when the path of \(B\) makes an angle of \(20 ^ { \circ }\) above the horizontal.