Question

A train departs from its station at a constant acceleration of 5 m/s². What is the speed of the train at the end of 20 seconds?

A) 50 m/s
B) 100 m/s
C) 150 m/s
D) 200 m/s

Answer 1

The speed of the train at the end of 20 seconds is 100 m/s.

Step-by-step explanation:

To find the speed of the train at the end of 20 seconds, we can use the formula:

Final speed = Initial speed + (Acceleration * Time)

In this case, the initial speed is 0 m/s (since the train starts from rest), the acceleration is 5 m/s², and the time is 20 seconds. Plugging these values into the formula, we get:

Final speed = 0 m/s + (5 m/s² * 20 s) = 0 m/s + 100 m/s = 100 m/s

Therefore, the speed of the train at the end of 20 seconds is 100 m/s (Option B).