For multiple choice questions, circle the one best answer or letter (unless more

Question

For multiple choice questions, circle the one best answer or letter (unless more than one answer is asked for). Show your work on free-response questions. Be sure to use proper units and significant figures in your final answers. Organization and neatness count, too. Do NOT use red ink- please reserve that color for grading. 1. a. (4 pts.) Two air-track gliders (similar to the ones used PHYS 151L lab) with equal and opposite speeds of 10.00 cm/s head toward each other and collide, sticking together. Glider A. coming from the left, has a mass of 250. g. while glider B, coming from the right, has a mass of 500. g. What is the final velocity of the stuck-together pair, and in which direction? (The gliders are constrained to move only along the x-axis. Ignore friction.) Show your work completely b. (3 pts.) Using the values above (both given and calculated), find the velocity (magnitude and system's center-of-mass twice: before the collision and after the collision. Show your work for both calculations.

Explanation / Answer

1

Conserving momemtum

(500*10)-(250*10)=(500+250)*v

We got v=3.3cm/s

Direction =to the left

(b) since there is not force ,center of mass's velocity will be same always i.e. equal to 3.3cm/s

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