\(\therefore \,\,u\sin \theta = 10 \times 3 = 30\)…..(i)

\(u\cos \theta = v\cos 30^\circ \)…..(ii)

\(v\sin {30^o} = u\sin \theta - g \times 2\)\(\left[ {{\rm{Using }}v = u - g\,t} \right]\)

\(v\sin {30^o} = 30 - 20\)\(\left[ {{\rm{As}}\,\,u\sin {\rm{ }}\theta = {\rm{30}}} \right]\)

\(\therefore \,\,v = 20\,m/s.\)

\(u\cos \theta = 20\,\cos {30^o}\)\( = 10\sqrt 3 \) …..(iii)

\(u = 20\sqrt 3 \) and \(\theta = 60^\circ \)