Imat 2018 question 55

Practice Question Solving
1

An electric train is travelling on a straight, horizontal track. A constant resultant force (greater than zero) acts on the train in the direction of the train’s motion.

What happens to the magnitude of the acceleration and to the magnitude of the velocity of the train while this force is acting?

A. The acceleration increases and the velocity remains constant.
B. The acceleration remains constant and the velocity increases.
C. The acceleration decreases and the velocity increases.
D. The acceleration remains constant and the velocity remains constant.
E. The acceleration increases and the velocity increases.

2

hi!

the answer is B), pushing the train increases the velocity, but the acceleration remains constant WHILE the force is acting, since this force is constant!!!

Don’t confuse this with the change in acceleration right at the moment when the force is added (in which case it increases)

Hope this is clear enough!

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