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ninjaerik4
30.08.2020 •
Physics
What is the momentum in Kg m/s of a 10 kg truck travelling at A) 5 m/s B) 20 cm/s C) 36 km/h?
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Ответ:
A) 50 kg m/s
B) 2 kg m/s
C) 100 kg m/s
Explanation:
Recall that momentum is a physical quantity defined by the product of the object's mass times its velocity. Therefore, in our case the truck's momentum (p) is:
A) p = m * v = 10 kg * 5 m/s = 50 kg m/s
B) p = m * v = 10 kg * 0.20 m/s = 2 kg m/s (notice that the velocity in cm/s was converted into m/s before multiplying)
C) the conversion from km/h to m/s is a little more involved, so we taclke it first:
since 1 km = 1000 m and 1 hour = 3600 seconds, we convert 36 km/h by replacing each unit by its m and s expression as shown below:
Then, the momentum is: p = m * v = 10 kg * 10 m/s = 100 kg m/s
Ответ: