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a man walked 100 meters east then went back running for 40 meters west. The whole travel took 45 seconds. Find the man's speed and velocity.
Speed is Distance/Time. Solving for the man's speed: Total distance covered by the man is 100meters + 40meters = 140 meters. Time it takes for the man is 45 seconds.. Therefore, the man's speed is 140meters/45seconds. Speed = 3.1 meters per second.
Velocity is displacement/time. displacement is the change in position.
For velocity of man: Velocity = (100-40)/45 = 60/45 =1.3 meters per second.
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