[填空题]
A stone is dropped from the roof of *6- r0c,0 bx*n 3qpui5kfnp oeyva 0.j;emokua high building. A seconskydebi .a*o(e-0h x5d stone is dropped 1.50 s later. How far apart are the stones when the second one has reache s .eoxdy-bie5ah (0k*d a speed of 12.0 m/s ? m