The x-acceleration a, is constant between times tį and t2. Let x1 and vx1 be the x-position and x-velocity at time t1, and x2 and v2, be the same at time t2. Let At be t2 - t1. Choose all expressions which must be true if the acceleration is constant. x2 = x1 + V1zAt + ;az (At)² O v2z = Vla + az (x2 – x1) O vž, = vi, + 2a# (x2 – x1) V2z = V1r + az (At)² V2x = V1x + a„At v = vie + 2a,At

A 1200 kg car is traveling towards a hill at a speed of 25.3 m/s when suddenly the car runs out of gas to what vertical hight in meters is the car able to coast up the hill before coming to a stop

(2) The box with M = 40kg shown below is being pulled by two pulleys exerting forces F₁ = 400 N (0₁ = 60°) and F₂ = 200 N (0₂= 15°) up an incline with an angle 0₁ = 30°. If the uk = 0.15. What is the acceleration of the box? Would the F₁ or F₂ be enough alone to pull the box up if the other pulley would stop working?

Answer last question "what is the ball's velocity when it returns to the ground?"

+y mg +x Surface is frictionless Pulley is massless and frictionless

Problem 4: Speed deamplifier. In the figure above on the right, block 1 of mass m1 slides along an x-axis on a frictionless floor at speed 4 m/sec.Then it undergoes a one-dimensional elastic collision with stationary block 2 of mass m2 = 2m1. Next, block 2 undergoes a one-dimensional elastic collision with stationary block 3 of mass mz = 4m1. What then is the speed of block 3? Answer: 16 m/sec or 1.78 m/sec.