The helicopter view in Figure P3.18 shows two people pulling on a stubborn mule. Assume that F, is 120 N and F2 is 80 N. The forces are measured in units of newtons (N). 75.0'8 3 60.0 Figure P3.18 (a) Find the single force that is equivalent to the two forces shown. magnitude direction (counterclockwise from the +x-axis) (b) Find the force that a third person would have to exert on the mule to make the net force equal to zero. magnitude direction (counterclockwise from the +x-axis) A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 20.0 m/s. The cliff is h = 51.0 m above a flat horizontal beach, as shown in Figure P3.24. Figure P3.24 How long after being released does the stone strike the beach below the cliff? With what speed and angle of impact does the stone land? m/s below the horizontal Hint: Active Figure 3.14 A brick is thrown upward from the top of a building at an angle of 10 to the horizontal and with an initial speed of 17 m/s. If the brick is in flight for 2.9 s, how tall is the building? m Hint: Active Figure 3.15 4. [-/10 Points] DETAILS SERCP7 3.P.031.SOLN. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 17.0 below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a constant acceleration of 2.75 m/s for a distance of 60.0 m to the edge of the cliff, which is 35.0 m above the ocean. (a) Find the car's position relative to the base of the cliff when the car lands in the ocean. m (b) Find the length of time the car is in the air