When will u know that initial velocity is not equal to zero while solving calculations on projectile

In such cases:

• If an object is launched with an initial velocity $u$ at an angle $\theta$ above the horizontal, its initial vertical velocity is given by $u_y = u \sin \theta$.
• If an object is thrown directly upwards or downwards, its initial vertical velocity will be the magnitude of the launch velocity (positive for upwards, negative for downwards).