A bus increases its speed from 20 km/hour to 50 km/hour in 10 second. Find its acceleration?
回答 (3)
2016-04-27 4:33 pm
Increase in speed, Δv
= (50 - 20) km/h
= 30 × (1 km) / (1 h)
= 30 × (1000 m) / (3600 s)
= 8.33 m/s
Time taken, Δt
= 10 s
Acceleration
= Δv / Δt
= (8.33 m/s) / (10 s)
= 0.833 m/s²
= (50 - 20) km/h
= 30 × (1 km) / (1 h)
= 30 × (1000 m) / (3600 s)
= 8.33 m/s
Time taken, Δt
= 10 s
Acceleration
= Δv / Δt
= (8.33 m/s) / (10 s)
= 0.833 m/s²
2016-04-27 4:45 pm
First change the speeds from km/h to m/s by multiplying by 1000/3600
v1 = 20 km/h = 20000/3600 = 5.555...m/s
v2 = 50 km/h = 50000/3600 = 13.888...
change in speed, Δv = 13.89 - 5.56 = 8.33 m/s
t = 10 s
Acceleration = chnage in speed / time = Δv / t
= (8.33 m/s) / (10 s)
= 0.833 m/s²
v1 = 20 km/h = 20000/3600 = 5.555...m/s
v2 = 50 km/h = 50000/3600 = 13.888...
change in speed, Δv = 13.89 - 5.56 = 8.33 m/s
t = 10 s
Acceleration = chnage in speed / time = Δv / t
= (8.33 m/s) / (10 s)
= 0.833 m/s²
2016-04-27 4:44 pm
(50-20)/10 = 3 km/h/s ANS
收錄日期: 2021-04-18 14:54:42
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https://hk.answers.yahoo.com/question/index?qid=20160427082756AAYVJqQ