May/June 2026 Paper 23

2026 · 5 questions · 39 parts · 60 marks

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1(a)Momentum Impulse CollisionsEasy1 mark
Define momentum.
1(b)
A ball X of mass 0.15 kg moves along a horizontal frictionless surface. The ball collides elastically with ball Y that is initially stationary. Balls X and Y have equal diameters but different masses.
Figure 1.1 shows the variation with time of the velocity of ball X before, during and after the collision.
Figure 1.1, a graph of velocity in m s-1 (y-axis, -2 to 2) against time in s (x-axis, 0 to 0.20), showing the velocity of ball X: constant at 1.6 from t = 0 to t = 0.09, a straight sloped line down to -0.8 by t = 0.12, then constant at -0.8 to t = 0.20
1(b)(i)Motion GraphsEasy2 marks
Determine the magnitude of the acceleration of ball X during the collision.
1(b)(ii)Momentum Impulse CollisionsEasy2 marks
Determine the magnitude of the change in momentum of ball X due to the collision.
1(b)(iii)Motion GraphsEasy2 marks
Determine the total distance travelled by ball X during the collision.
1(c)(i)Momentum Impulse CollisionsMedium2 marks
By considering relative speeds, explain why the velocity of ball Y after the collision must be m s.

Answer

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1(c)(ii)Momentum Impulse CollisionsEasy2 marks
On Figure 1.1, sketch the variation of the velocity of ball Y with time between time = time = .
Diagram to annotate
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Draw with the mouse or a finger.
1(c)(iii)Momentum Impulse CollisionsEasy2 marks
Calculate the mass of ball Y.