Standard +0.3 This is a straightforward projectile motion problem requiring resolution of velocity components and use of the tangent relationship. Students must find when tan(40°) = -v_y/v_x using standard kinematic equations, which is a routine application of mechanics principles with no novel insight required.
A particle is projected with speed \(20\,\text{m}\,\text{s}^{-1}\) at an angle of \(60°\) above the horizontal. Calculate the time after projection when the particle is descending at an angle of \(40°\) below the horizontal. [4]
A particle is projected with speed $20\,\text{m}\,\text{s}^{-1}$ at an angle of $60°$ above the horizontal. Calculate the time after projection when the particle is descending at an angle of $40°$ below the horizontal. [4]
\hfill \mbox{\textit{CAIE M2 2017 Q1 [4]}}