A stationary ball with 2.5 kg slides from 1.25 m , find the ball speed when it reaches 0.75 m, fig.     H1=1.25 m H1=0.75 m

You are an engineer in charge of designing a new generation of elevators for a prospective upgrade to the Empire State Building Before the state legislature votes on funding for the project, they would like you to prepare a report on the benefits of upgrading the elevators. One of the numbers that they have requested is the time it will take the elevator to go from the ground floor to the 102nd floor observatory. They are unlikely to approve the project unless the new elevators make the trip much faster than the old elevators. If state law mandates that elevators cannot accelerate more than 2.40 m/s² or travel faster than 11.3 m/s, what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor? minimum travel time:

If D+E = 6.0i and D - E = 21 – 4j: then Dequals a. 8î – 4j O b.4î – 2j OC. 2î – 4j O d. 6î

OK, same sort of track, but now with d = 2.80 m. Now suppose the blocks starts on the track at x = 3.20 m. The block is given a push to the left and begins to slide up the track, eventually reaching its maximum height at x = 0, at which point it turns around and begins sliding down. What was its initial speed in this case?     8.47 m/s     5.99 m/s     10.12 m/s     4.83 m/s

Note the expression: y = x. Which statement is most consistent with this expression? O if x triples, then y doubles O y is greater than x O if x doubles, then y quadruples O if x doubles, then y doubles O if y doubles, then x quadruples

Page > of 4 22. The accompanying graph shows Marie's distance from home (A) to work (F) at various times during her drive. Marie's Trip to Work 20 15 10 DE 10 15 20 25 30 35 40 Time (min) Marie left her briefcase at home and had to return to get it. State which point represents when she turned back around to go home and explain how you arrived at that conclusion. a b. Marie also had to wait at the railroad tracks for a train to pass. How long did she wait? MacBook Air 50 F3 I F8 > F9 5 FIO 44 F7 F5 %23 %24 & 3 4. 5 8 R Y D F H. K 60 (ju) ewoH woJj eouejsic

A ball is thrown vertically upward with an initial speed v and reaches a maximum height y1. The same ball is thrown with an initial speed 3v to reach the maximum height y2. What is the correct relationship between y2 and y1? А. y2 = ½ y1 В. y2 = 2 y1 %D С. y2 = 4 y1 y2 = 9 y1 D.

At the Earth's surface, a projectile is launched straight up at a speed of 7.5 km/s. To what height will it rise? Ignore air resistance. 2.87e+06 Your response differs from the correct answer by more than 10%. Double check your calculations. m

Note the expression: y = x. Which statement is most consistent with this expression? O if x triples, then y doubles O ifx doubles, then y doubles O ifx doubles, then y quadruples O ify doubles, then x quadruples O y is greater than x

A car brakes with a constant acceleration. If the car's speed is tripled, the time to come and the stopping distance changes by a factor of to a stop changes by a factor of 0 9,3 O 9, 9 O 1,1 (unchanged) O 3, 9