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This Brain Teaser Will Leave You Debating On Speed & Motion
A viral Reddit brain teaser about two pucks on a frictionless surface has social media users debating which will finish first, challenging even physics enthusiasts.
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Brain teasers have long captivated puzzle enthusiasts, stimulating creative and analytical thought by encouraging fresh perspectives on problem-solving. Recently, a physics-based brain teaser went viral on Reddit, challenging users to determine which of two identical pucks would cross the finish line first.
In the scenario, two identical pucks are pushed across a frictionless surface with the same starting speed. Both pucks must travel the same distance, but one puck takes a flat path while the other navigates a dip before returning to the same height as the first. Despite seeming straightforward, this brain teaser—originally posed in a job interview—tests fundamental physics concepts related to speed and motion.
The brain teaser, shared by Reddit user @computertest123, ignited debate among Redditors. One commenter, openingsolution_4795, speculated that the puck traveling over the dip would be unaffected by it: “The question says the puck slides across the dip implying it is wide enough for the dip to have no effect on it whatsoever. Therefore, the pucks both arrive at the same time. Call it a trick question if you like.”
Adding to the conversation, thephysicstutor argued that because the horizontal distance and starting velocities are identical, both pucks should cross the finish line simultaneously, explaining, “Both reach at the same time. Since the horizontal distance and initial velocities are the same, the time taken should be the same too—by the kinematic equation: distance (in x) equals velocity (in x) * time.”
As Reddit users continue to discuss their solutions, the physics teaser remains a test of understanding speed and motion principles. Could you crack it? If not, give it another try and see if you can join the few who have solved it correctly.
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Khushi Patel author
Khushi Patel is a copy editor at Times Network. With a background in content writing at Zee Media, she has experience in diverse fields like entertain...View More
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