1. In 1985, Matt Biondi set a record for the men\'s 100 m freestyle event in swi

Question

1. In 1985, Matt Biondi set a record for the men's 100 m freestyle event in swimming. It took him 49.17 s to swim the 50.0 m length of the pool and swim back. Assume that half of Biondi's record time was spent traveling the length of the pool. What was his speed?

2. The longest stretch of straight railroad tracks lies across the desolate Nullarbor Plain, between the Australian cities of Adelaide and Perth. The tracks extend a distance of 478 km without a curve. How long would it take a train moving at a constant speed of 43 m/s to travel this length of track?

Please answer these questions, showing work, and with the format of distance =, velocity =, and time =, for both problems. Thank you.

Explanation / Answer

1)time = 49.17s / 2 = 24.585 s speed = D/T = 50 / 24.585 = 2.033 m/s 2) t = ? d = 478km v = 97 km/h v = d/t t = d/v t = (478 km) / (97 m/s) t = 4.93 h

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