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Find the value of $u$ and then the value of $s$.
Mathematics 9709 · AS & A Level · Kinematics of motion in a straight line
Kinematics of motion in a straight line — practice question
A particle is fired vertically upwards from horizontal ground with speed $u\,\text{m s}^{-1}$. Its height above the ground is $s\,\text{m}$ at 3 seconds and again at 4 seconds after projection.