1. A rescue plane wants to drop supplies 260 m below. If the plane is travelling at a speed of 75.0 m/s, what is the magnitude of the velocity of the supply when it lands? m/s7. A projectile is shot from the edge of a cliff 170 m above ground with an initial speed of 75.0 m/s at an angle of 320 below the horizontal. How much time does it take the projectile to hit the ground? seconds