At the moment before impact between disks A and B, the velocities are in the dir

Question

At the moment before impact between disks A and B, the velocities are in the direction shown, where vA= 2m/s and vB= 4m/s. B= 30°. The coefficient of restitution is e=0.5. Is momentum conserved in the y direction during the impact?

Select one:

a. Yes, but only if the system is defined to include only A

b. Yes, but only if the system is defined to include only B

c. No, momentum is never conserved during an impact

d. Yes, provided that the system is defined to include both A and B

e. None of these.

Explanation / Answer

for the collision , as there is no external force acting on the system during the duration of collision
Here ,
the c
the net momentum of the system (both balls A and B) will remain constant

the correct option is

d. Yes, provided that the system is defined to include both A and B

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