# Physics

If you have swam one lap in a swimming pool, that means you have swam from one end to the other and back. In 4.5 h, a swimmer makes exactly 69 laps in a swimming pool that is 35 m long. Determine the distance the swimmer traveled, the total displacement of the swimmer, the swimmer's average velocity, and the swimmer's average speed.

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1. DISTANCE

D = 2 * (# of laps) * (length of pool)
D = 2*69*35 = 4830 m

TOTAL DISPLACEMENT

You're going by the swimmer's final position, so if he ends up at the same place he started, the net distance (or in other words, the displacement) is 0.

AVERAGE VELOCITY

Displacement's 0, so average velocity must also be 0 (since avg. velocity = displacement/time).

AVERAGE SPEED

Speed = (total distance)/(time)
Speed = (4830)/(4.5 hours)
Speed = (4830)/(16200 s)
Speed = 0.298 m/s

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posted by John

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