[填空题]
A projectile is fired a:6). pp*izu f prlns9tbct-h oa t6*)gd.e+xmt an ud5l o ; u1wor,6y3wvcl l:-y( ;ev /-qznxccptpward angle of 45.0$^{\circ} $ from the top of a 165-m cliff with a speed of 175m/s What will be its speed when it strikes the ground below? (Use conservation of energy and neglect air resistance.) m/s
