7. An object is thrown vertically upward with a speed of 25 m/s. How much 1 point time passes before it comes back down at 15 m/s? (Air resistance is negligible.) a. 1.0 s b. 4.1 s O c. 9.8 s O d. 18 s O e. 27 s8. An object is thrown vertically upward at 18 m/s from a window and hits 1 point the ground 1.6 s later. What is the height of the window above the ground? (Air resistance is negligible.) a. 3.7 m O b. 16 m c. 21 m d. 37 m e. 41 m9. A jogger is running at 4.2 m/s when she begins to accelerate uniformly. If 1 point she runs a distance of 14 m in the next 3.0 s, what is her new speed? O a. 17 m/s b. 14 m/s c. 7.7 m/s d. 5.1 m/s e. 4.9 m/s10. An object is thrown vertically downward at 3.2 m/s. How long will the 1 point object take to hit the ground 12 m below? O a. 3.8 s b. 3.1 s O c. 2.0 s O d. 1.0 s O e. 1.3 s11. A car is travelling north when it enters a curve. It maintains a constant 1 point speed and leaves the curve travelling east. The direction of the car's acceleration is O a. south-east O b. north-east O c. east O d. south O e. the car does not accelerateThe free-body diagram of a wagon being pulled along a horizontal surface is best represented by A B C D E FN PP PP Op F. a. A d. D b. B e. E C. O A O B O c O O None of the aboveThe free-body diagram of a block being pushed up a rough ramp is best represented by A B C D E F F. F. F. A d. D b. e. E C. O A O B O c O D O E None of the aboveA 24-kg traffic light is suspended from the midpoint of a cable suspended between two poles. The angle between the cable and the pole is 80" at both poles. The net force acting on the traffic light has a value of a. zero d. 2.4 x 10' N b. 47N e. 4.6 x 10' N C. 82 N O A O O C O D O E O None of the aboveA force of 12 N acting in a direction [30"E of S] is equivalent to which of the following pairs of forces acting simultaneously? a. 24 N [S], 14 N [E] d. 6 N [S], 10 N [E] b. 14 N [S], 24 N [E] 10 N [S], 6 N [E] C. 12 N [S], 12 N [E] OA O B O C O D O O None of the aboveA 1.5-kg cart is pulled with a force of 7.3 N at an angle of 40 above the horizontal. If a kinetic friction force of 3.2 N acts against the motion, the cart's acceleration along the horizontal surface will be a. 5.0 m/s2 d. 1.6 m/s' b. 2.7 m/s e. 1.0 m/s' C. 2.4 m/s OA O B O C O D OE O None of the aboveForces of 2.4 N and 1.8 N act on an object at right angles to one another. What is the magnitude of a third force acting on the same object so that it remains stationary? a. 90N d. 2.7N b. 42 N e. 0.6N C. 3.ON O A O B O C O D O E O None of the above19. 1 point An object's "weight" a. depends on its mass b. depends on the gravitational field strength C. is properly measured in "newtons" d. is equivalent to the force of gravity acting on the object e. all of the above O A O O O D O E None of the above