Physics (AS & A Level) · Oct / Nov 2024 · Paper 11 · Question 12
9702Linear momentum and its conservation
A disc of mass M is moving across a horizontal frictionless surface with constant velocity u. It collides with a stationary disc of mass 4M. The diagram shows the view from above of the motion of the two discs before and after the collision. What is the initial velocity u of the disc of mass M?
- A1.1 m s⁻¹
- B1.4 m s⁻¹
- C3.5 m s⁻¹
- D5.7 m s⁻¹
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Correct answer: D. 5.7 m s⁻¹
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