Question

A train starts from rest and travels for 5.0 s with a uniform acceleration of 1.5 m/s2. What is the final velocity of the train?

Answer 1

Answer:

Final speed of the train is 7.5 m/s

Explanation:

It is given that,

Uniform acceleration of the train is, a = 1.5 m/s²

It starts from rest and travels for 5.0 s. We have to find the final velocity of the train. By using first equation of motion as :

$v=u+at$

Here, train starts from rest so, u = 0

$v=0+1.5\ m/s^2\times 5\ s$  

v = 7.5 m/s

So, the final velocity of the train is 7.5 m/s. Hence, this is the required solution.

Answer 2

Answer:

$7.5m/s$

Explanation:

We use the formula to find the final velocity for the movement with constant acceleration:

$V_{f}=V_{i}+at$

where

$V_{f}$ is the final velocity of the train

$V_{i}$ is the initial velocity of the train, since it starts from rest $V_{i}=0$

$a$ is the acceleration, $a=1.5m/s^2$

and $t$ is the interval of time,  $t=5s$

So, replacing the values in the formula we get:

$V_{f}=0+(1.5m/s^2)(5s)$

$V_{f}=7.5m/s$

The final velocity of the train is   $7.5m/s$