A train starts from rest to attain 20m/s in 5s. Calculate the accelera

1.	A train starts from rest to attain 20m/s in 5s. Calculate the acceleration of the train??
Answer» Given: A train starts from rest i.e. it had an INITIAL velocity of 0m/s. It attains a velocity of 20m/s . The time taken to achieve that velocity is 5 seconds . To Find: The acceleration of the train . Answer: Initial velocity = 0m/s (u). Final velocity = 20m/s (v) . Time taken = 5 seconds (t). Now , acceleration is DEFINED as the RATE of change of velocity . $\large{\underline{\boxed{\red{\bf{\leadsto accel^{n}=\dfrac{v-u}{t}=\dfrac{\Delta v}{\Delta t}}}}}}$ $\sf{\implies accel^{n}= \dfrac{20m s^{-1}-0m s^{-1}}{5}}$ $\sf{\implies accel^{n}=\dfrac{20m s^{-1}}{5 s}}$ $\boxed{\bf{\leadsto accel^{n}=4 ms^{-2}}}$ Hence the acceleration of the object was 4m/s².