May/June 2026 Paper 11

2026 · 40 questions · 40 parts · 40 marks

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12Momentum Impulse CollisionsHard1 mark
The diagram shows the view from above of two hard balls rolling along a horizontal table.
view from above of ball P moving right at 5.5 m s⁻¹ toward collision point X, and ball Q, positioned below and to the right of P, moving upward at 4.2 m s⁻¹ toward the same point X
The balls each have a mass of 0.16 kg.
The initial velocity of ball P is 5.5 m s and the initial velocity of ball Q is 4.2 m s.
The initial velocity of ball P is perpendicular to the initial velocity of ball Q.
The balls collide at point X where ball Q stops immediately.
There are no resistive forces acting on the balls.
What is the speed of ball P after the collision?