A3.00 kg brick slides down a 20.0 m long hill which is inclined at 25.00 above the horizontal (note: this is the length of the hill, not the height). what is the speed of the block when it gets to the bottom of the hill? a. 166 m/s b. 12.9 m/s c. 15.8 m/s d. 19.8 m/s 29. you spin a 85.0 cm diameter wheel and notice that a stone stuck on the outside of the wheel travels 2.50 revolutions every second. what is the speed of the pebble? a. 668 m/s b. 6.68 m/s c. 13.4 m/s d. 1.06 m/s 30. select all the statements that are true. a. if there is no net force acting on an object, it must be at rest. b. if there is no net force acting on an object, its velocity will remain constant. c. an object that is moving at a constant velocity has no forces acting on it. d. an object that is at rest has no forces acting on it. e. an object that is at rest has no net force acting on it. 31. a satellite is orbiting the earth at an altitude of 36000.0 km above the surface of the earth. what is the speed of the satellite? a. 20.4 km/s b. 18.8 km/s c. 3.33 km/s d. 3.07 km/s 32. a ball is kicked from the ground with an initial velocity of 13 m/s at an angle 250 above the horizontal. how long does it take for the ball to hit the ground? a. 1.15 s b. 5.49 s c. 2.40 s