a projectile is launched at an angle of 11 degrees above horizontal. what is its initial speed if it hits a target that is located a horizontal distance of 145m from launch point and 10.5m below the launch level

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?