Answer
$a=5.03m/s^2$
Work Step by Step
There are 3 forces acting on the motorcycle: propulsion force $P$, the weight of the motorcycle $mg\sin\theta$ and air resistance $R$.
From the set-up of the forces as portrayed in the image, we have $$\sum F=P-mg\sin\theta-R$$ $$\sum F=3150N-(292\times9.8\times\sin30)N-250N$$ $$\sum F=1469.2N$$
The acceleration of the motorcycle is $$a=\frac{\sum F}{m_{motor}}=5.03m/s^2$$
