7. Q: "If you must average 60 km/h for a 90 km trip, and you only average 40 km/h for the first 40 km, what velocity must you average the rest of the way?"(adsbygoogle = window.adsbygoogle || []).push({});

A:

90 km 60km/h 1.5h

d v t

1st

40 km 40 km/s 1h

d v t

2nd

50 km ? 0.5h (1.5-1h = 0.5h)

d v t

v = d/t = 50km/0.5h =100 km/h

Is this the right answer and is it the right way of solving it?

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# Homework Help: Simple constant velocity question

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