A ball is projected from horizontal ground with speed 20 m s−1^{-1}−1 at an angle of 30° 30°\,30° above the horizontal. The ball is modelled as a particle and air resistance is modelled as negligible.
State the initial vertical component of the velocity of the ball.
Tick one box.
10 m s−1^{-1}−1
17.3 m s−1^{-1}−1
20 m s−1^{-1}−1
40 m s−1^{-1}−1