Hi @Ossama
You have entered the input matrix B as a single column vector, causing a dimension mismatch. Consequently, the state-space block expects only ONE (1) input to be provided. There are two ways to resolve this issue: you can either adjust the input side or the state-space side. However, without seeing the actual differential equation that involves both the Step signal and the Gravitational Acceleration (9.81), there is uncertainty regarding the correctness of the B matrix entry.
