AP Physics 1 I do not understand how to solve this problem. Would you please als

Question

AP Physics 1

I do not understand how to solve this problem. Would you please also explain why the correct answer is correct and why the incorrect answers are incorrect. Thank you.

v (m/s) 1.25 1.00 0.75 0.50 0.25 I (s) 0 .1 0.2 0.3 0.4 0.5 A student on another planet has two identical spheres, each of mass 0.6 kg, attached to the ends of a rod of negligible mass. The student gives the assembly a rotation in the vertical plane and then releases it so it falls, as shown in the top figure above. Sensors record the vertical velocity of the two spheres, and the data is shown in the graph of velocity v as a function of time t. Another student wants to calculate the assembly's angular speed and the change in the linear momentum of the center of mass of the assembly between 0 s and 0.3 s. Which of these quantities can be determined using the graph? (A) Angular speed only (B) Change in linear momentum only (C) Angular speed and change in linear momentum (D) Neither of these quantities can be determined using the graph.

Explanation / Answer

correct answer is B

because given qty are mass and from graph change in velocity can me found.

We know that change in momentum = mass x change in velocity

angular velocity = linear velocity /radius

radius is an unknown qty.

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