A train departs from its station at a constant acceleration of 5m/s^2 What is the speed of the train after 20 s? a 0.4m/s b 100m/s C -100m/s d 4m/s

## Step1: Identify the given values### The problem provides the acceleration and the time .## Step2: Use the formula for final velocity### The formula for final velocity under constant acceleration is , where is the initial velocity. Since the train starts from rest, .## Step3: Substitute the values into the formula### Substituting , , and into the formula .## Step4: Calculate the final velocity### Performing the calculation: .