(a)[4]
Find the height above the ground where $P$ and $Q$ collide.
(b)[5]
Find the speed of the combined particle at the instant that it reaches the ground.
Mathematics 9709 · AS & A Level · Momentum
Momentum — practice question
A particle $P$ with mass $0.1\text{ kg}$ is launched vertically upward at $30\text{ m s}^{-1}$ from level ground. At the same moment, a particle $Q$ with mass $0.4\text{ kg}$ is launched vertically upward at $10\text{ m s}^{-1}$ from a point $15\text{ m}$ above the ground. $P$ and $Q$ travel along the same vertical line. When $P$ and $Q$ collide, they stick together.