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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

Respuesta :

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
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.

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