Until a train is a safe distance from the station it must travel at 5 m/s. Once the train is on open track it can speed up to 45

Question

3 years ago

15

Until a train is a safe distance from the station it must travel at 5 m/s. Once the train is on open track it can speed up to 45

m/s. If it takes a train 8 seconds to reach 45 m/s, what is the acceleration of the train? (Round your answer to the nearest whole number.)
A) 4 m/s2
B) 5 m/s2
C) 6 m/s2
D) 7 m/s2

Mathematics

2 answers:

jok3333 [9.3K] · Answer 1 · 2022-05-11T12:55:20+03:00

jok3333 [9.3K]3 years ago

6 0

The answer is 5 because acceleration=change speed/change time
change time=8
change speed=45-5=40
40/8=5

5 m/s^2 is acceleration

Aneli [31] · Answer 2 · 2022-05-11T11:39:05+03:00

Aneli [31]3 years ago

3 0

The correct answer is B) 5 m/s².

Explanation:
To find acceleration, we find the ratio of the change in velocity to the change in time. The change in velocity is 45-5=40. It takes 8 seconds, so the change in time is 8. 40/8=5.