1. A projectile is fired with an initial speed of 25 m/s horizontally off a 20-meter cliff. What is (a) the total time in the air, (b)the total horizontal distance covered, and (c)the speed of the projectile 0.5 s after firing?

2. A 30-kg box is at rest on a rough inclined surface of 10 degrees. What applied force is necessary to get the box to start moving up the incline?(b) If an applied force of 250 N is applied up the incline, what acceleration will the box have up the incline? (Coefficient of static and kinetic friction: 0.3 and 0.22 respectively)? (c) If an applied force of 150 N is applied down the incline, what acceleration will the box have down the incline?