Question

helicopter speed increases from 30 m/s to 40 m/s in five seconds what is the acceleration of this helicopter

Answer 1

The helicopter undergoes an average acceleration of

$\dfrac{40\frac{\rm m}{\rm s}-30\frac{\rm m}{\rm s}}{5\,\mathrm s}=2\dfrac{\rm m}{\mathrm s^2}$