[填空题]
A projectile is fired hu wr+xu4 +v0u200kyk *wvrcn at an upward ako9 f v-4nae,cngle 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
