Answer
$0.13$ $m/s^{2}$
Work Step by Step
We have,
$Force = Mass\times Acceleration$,
So,
$\frac{Force}{mass}= Acceleration$
Substituting the known values, it gives :
$\frac{5.2 N } {40 kg}=Acceleration$
$Acceleration = 0.13$ $m/s^{2} $
So, acceleration of sled is $0.13$ $m/s^{2}$.
