Question

What is the uniform acceleration that causes a train’s velocity to change from 25 m/s to 75 m/s in an 5.0-s period?


A. 20 m/s2
B. 5 m/s^2
C. 10 m/s2
D. 15 m/s^2

Answer 1

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The best and most correct answer among the choices provided by the question is C. 10 m/s2  

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Answer 2

Answer:

Acceleration of the train is $10\ m/s^2$

Explanation:

It is given that,

Initial speed of the train, u = 25 m/s

Final velocity of the train, v = 75 m/s

Time taken, t = 5 s

Charge in speed, $v-u=75-25=50\ m/s$

Acceleration of the train is given by change in speed per unit time. It is given by :

$a=\dfrac{v-u}{t}$

$a=\dfrac{50\ m/s}{5\ s}$

$a=10\ m/s^2$

So, the acceleration of the train is $10\ m/s^2$. So, the correct option is (c).