In this question use g=9.8g = 9.8g=9.8 m s−2^{-2}−2
A ball is projected vertically upwards from ground level with speed 21 m s−1^{-1}−1.
The ball is modelled as a particle moving freely under gravity.
Using the model, find the two times at which the ball is 15 metres above the ground.
State one modelling assumption you have made in part (a) and explain one effect it has on your answers.
102 exam-style questions on WJEC A Level Maths 2.7 Kinematics, covering 2.7.1 Kinematics, 2.7.2 Kinematics, 2.7.3 Kinematics, and 2.7.4 Kinematics. Each one has a worked solution and a mark scheme showing where the marks go.