The maximum heights of a projectile for two complementary angles of projection are \( 50 \, \text{m} \) and \( 30 \, \text{m} \) respectively. The initial speed of projectile is: \( (g = 10 \, \text{m/s}^2) \)
\( 10\sqrt{34} \, \text{m/s} \)
\( 40 \, \text{m/s} \)
\( 20 \, \text{m/s} \)
\( 10 \, \text{m/s} \)