- #1

pezzang

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There is a picture of two tracks(lines) that are horizontal and parallel to each other. In the middle of tracks, both have "bumps," Track A has concave down bump, Track B has a concave down bump.

(a) Two smooth tracks of equal length have "bump" - A up, and B down. Both "bumps" have the same curvature. IF two balls start simultaneously with the same initial speed, will they complete their journey at the same time or not? If not, which will arrive first? Explain your answer clearly.

-> My guess is that both tracks will complete their journey at different time. But, I am not exactly sure why and how they will complete at different time. Please teach me.

(b) If the initial speed of the balls is 2m/s and teh speed of the ball at teh bottom of the curve on track B is 3m/s, will the speed of the ball at the top of the curve on Track A be greater than, less than, or equal to 1m/s? Explain your answer clearly.

-> The speed will be exactly 1m/s because w = mgh can be applied. Because the mass, height and g(9.9m/s^2) are the same in both cases, the answer will be 1m/s.

Am I right??? Or am I totally ignorant?