# i dont get physics D: helpp

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If you imagine that the car in front is actually not moving, then the car behind takes three seconds to catch up with it. Also you can see that 110km/h is a speed measurement that is given by a distance (kilometres) divided by a time (hours). So this tells us that a distance measurement can be giving by multiplying speed by time.
To solve this problem, first you need to convert hours to seconds, and kilometres to metres. 1km = 100m and 1hour = 3600 seconds so 110km/h = [(110 x 1000) metres]/ [3600 seconds] = (110,000/3600) metres per second = 30.5555555... m/s.
This tells us that every second the cars are travelling 30.55555... metres, so that in 3 seconds they must travel 91.66666666... metres, which is about 92 metres.

24 September 2012

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