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April 20, 2014

Homework Help: physics- what did i do wrong

Posted by jeff on Wednesday, August 29, 2007 at 4:00pm.

If the bus is 100 meters ahead of the car and the bus is travling at 65 km/hr and the car at 78km/hr, how long will it take the car to catch the bus?

I used the following formula, but was informed my answer was wrong.

100m + (t) 65km/hr = 0 + (t)78km/hr

and solved for (t).

t = 100m / (78km/hr - 65km/hr)

I converted km/hr to m/sec and did the math and got

t = 100m / (21.668 m/sec - 18.057 m/sec)

t = 100m / 3.611 m/sec

t = 27.693 seconds

What did I do Wrong?

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