A disc of mass $$\(M\)$$ is moving across a horizontal frictionless surface with constant velocity $$\(u\)$$. It collides with a stationary disc of mass 4 M . The diagram shows the view from above of the motion of the two discs before and after the collision. What is the initial velocity $$\(u\)$$ of the disc of mass $$\(M\)$$ ?
A.
\(1.1 \mathrm{~m} \mathrm{~s}^{-1}\)
B.
\(\quad 1.4 \mathrm{~m} \mathrm{~s}^{-1}\)
C.
\(3.5 \mathrm{~m} \mathrm{~s}^{-1}\)
D.
\(\quad 5.7 \mathrm{~m} \mathrm{~s}^{-1}\)
Exam No：9702_w24_qp_11 Year：2024 Question No：12
Answer:
D
Knowledge points:
4.1.1 understand that mass is the property of a body that resists change in motion
4.1.2 recall the relationship F=ma and solve problems using it, appreciating that acceleration and resultant force are always in the same direction
4.1.3 define and use linear momentum as the product of mass and velocity
4.1.4 define and use force as rate of change of momentum
4.1.5 state and apply each of Newton’s laws of motion
Solution:
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