(a) For inviscid and incompressible flow coefficient of pressure is given as  $${C_p} = 1 – {\left( {\frac{v}{{{v_\infty }}}} \right)^2}$$ $$v = \sqrt {v_\infty ^2\left( {1 – {C_p}} \right)}$$ $$= \sqrt {{{\left( {50} \right)}^2}\left( {1 – \left( { – 3.84} \right)} \right)}$$ $$= \sqrt {2500\left( {1 + 3.84} \right)}$$ $$= 110\,{\rm{ft/sec}}$$ also (b) for ${{v_\infty }}$ = 200 ft/sec  $${C_p} = 1 – {\left( {\frac{v}{{{v_\infty }}}} \right)^2}$$ $$v = \sqrt {v_\infty ^2\left( {1 – {C_p}} \right)}$$ $$= \sqrt {{{\left( {200} \right)}^2}\left( {1 – \left( { – 3.84} \right)} \right)}$$ $$= \sqrt {40000\left( {1 + 3.84} \right)}$$ $$= 440\,{\rm{ft/sec}}$$