[填空题]
A projectile is fired agis*.q0cwwjn(2 s0w zmik :+z t an upwar2 goy hu6o(e3.c l5gpyd 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
