# A helicopter’s speed increases from 25 m/s to 60 m/s in 5 seconds. What is the acceleration of this helicopter?

Mar 13, 2018

#### Answer:

7"" ms^-2

#### Explanation:

Let acceleration be $\textcolor{\in \mathrm{di} g o}{\text{ } a}$
Initial velocity be $\textcolor{\in \mathrm{di} g o}{\text{ } u}$
Final velocity be $\textcolor{\in \mathrm{di} g o}{\text{ } v}$

$u = 25 m {s}^{-} 1$

$v = 60 m {s}^{-} 1$

In newtonian physics

$a = \frac{v - u}{t} \text{ or } \frac{\Delta v}{\Delta t}$

$a = \frac{60 - 25}{5}$

$a = \frac{35}{5} = 7 m {s}^{-} 2$

In modern physics
we need to consider time dilation.

since the velocities are too small the results would be same to more than 5 decimal places..