(i)[3]
Show that $B$ is projected horizontally, and find the speed at which it is projected.
(ii)[6]
Find the value of $y$ when the direction of motion of $B$ is $60^\circ$ below the horizontal, and find the speed of $B$ at that point.
Mathematics 9709 · AS & A Level · Representation of data
Representation of data — practice question
The path of a small ball $B$ launched from a fixed point $O$ is given by $y = -0.05x^2$, where $x$ and $y$ represent the horizontal and vertically upwards displacements of $B$ from $O$, in metres, respectively.