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vivado [14]
3 years ago
15

A train travels 63 kilometers in 2 hours, and then 56 kilometers in 3 hours. What is its average speed? i need the answer and un

its please
Physics
1 answer:
kolbaska11 [484]3 years ago
4 0
The average speed is the ratio between the total space and the total time of the motion:
v= \frac{S_{tot}}{t_{tot}}
The total space is 
S_{tot}=63 km + 56 km = 119 km
while the total time is 
t_{tot}=2h+3h = 5h
So, the average velocity is
v= \frac{119 km}{5 h} =23.8 km/h


We can also rewrite it in m/s. The total space is S_{tot}=119000 m, while the time is t_{tot}=5h\cdot 3600 s/h = 18000s, and so
v= \frac{119000m}{18000s}=6.6 m/s
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