(i)[3]
Show that $B$ is projected horizontally, and determine its speed of projection.
(ii)[6]
Find the value of $y$ when the direction of motion of $B$ is $60^\circ$ below the horizontal, and determine the corresponding speed of $B$.
Mathematics 9709 · AS & A Level · Representation of data
Representation of data — practice question
The trajectory equation for a small ball $B$, launched from a fixed point $O$, is $y = -0.05x^2$, where $x$ and $y$ are the horizontal and vertically upward displacements, in metres, of $B$ from $O$, respectively.