(i)[4]
Find the height above the ground where the two particles meet.
(ii)[3]
Find the difference between the speeds of the two particles at the moment of collision.
Mathematics 9709 · AS & A Level · Kinematics of motion in a straight line
Kinematics of motion in a straight line — practice question
Particles $A$ and $B$ travel along the same vertical straight line. $A$ is launched vertically upwards from the ground at $20\,\text{m s}^{-1}$. After 1 second, $B$ is released from rest from a height of $40\,\text{m}$.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Valid height expressions, for example $h_A = 20t - \tfrac12\times10t^2$ and $h_B = \tfrac12\times10(t-1)^2$” …
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