You can enter units that are combinations of units with prefixes. however, you must maintain the same unit system given in the problem. for example, this question uses the si unit system. therefore an answer in u. s. customary units, such as miles per hour would not be accepted as correct. a car traveling with constant speed travels 150 km in 7200 s. what is the speed of the car?

Question

Physics

Journey Pham

21 April, 10:52

You can enter units that are combinations of units with prefixes. however, you must maintain the same unit system given in the problem. for example, this question uses the si unit system. therefore an answer in u. s. customary units, such as miles per hour would not be accepted as correct. a car traveling with constant speed travels 150 km in 7200 s. what is the speed of the car?

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Answers (1)

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Edwin Madden · Answer 1

You have forgotten to give the units for the '150'. Is it miles, km or something else?

Also, the question is badly worded. I'm guessing the question should say:

A car travels 150km in 2 hours. Give the speed in standard SI units (metres/second, m/s).

150km = 150000m

2 hours = 2 x 3600s = 7200s

Speed = distance / time = 150000m / 7200s = 20.8 m/s