PHYSICS
JAMB 2012 - Question 6
Physics 2012 JAMB Past Questions - Question 6: Calculate the total distance covered by a train before coming to rest if its initial speed is 30ms-¹ with a constant retardation of 0.1
Choose the correct answers from the options given.
A:
B:
C:
D:
Correct Answer
B
Explanation
To calculate the total distance covered by the train before coming to rest, we can use the equation of motion:
v² = u² + 2as
Where:
v = final velocity (0 m/s, since the train comes to rest)
u = initial velocity (30 m/s)
a = acceleration (retardation in this case, which is -0.1 m/s²)
s = distance covered
Rearranging the equation, we have:
s = (v² - u²) / (2a)
Substituting the given values, we get:
s = (0² - 30²) / (2 * -0.1)
s = (-900) / (-0.2)
s = 4500 meters
Therefore, the total distance covered by the train before coming to rest is 4500 meters.
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