Moderate -0.8 This is a straightforward projectile motion question requiring only standard kinematic equations to find velocity components at a given time, then combining them for speed and direction. It's below average difficulty as it involves direct application of v = u + at with no problem-solving or geometric insight required.
A small ball \(B\) is projected from a point \(O\) on horizontal ground. The initial velocity of \(B\) has horizontal and vertically upwards components of \(18 \text{ ms}^{-1}\) and \(25 \text{ ms}^{-1}\) respectively. For the instant \(4 \text{ s}\) after projection, find the speed and direction of motion of \(B\). [4]
A small ball $B$ is projected from a point $O$ on horizontal ground. The initial velocity of $B$ has horizontal and vertically upwards components of $18 \text{ ms}^{-1}$ and $25 \text{ ms}^{-1}$ respectively. For the instant $4 \text{ s}$ after projection, find the speed and direction of motion of $B$. [4]
\hfill \mbox{\textit{CAIE M2 2018 Q1 [4]}}