4. Consider the following figure and do the following: Skg He = 0.2 5m d) Find the acceleration of the block down the incline. e) What is the velocity of the block at the bottom of the incline? f) How long does it take for the block to reach the bottom of the incline? 5. Two blocks of masses m, = 5 kg and my = 2 kg are placed in contact with each other on a frictionless, horizontal surface as shown in the figure below. If a constant force F, whose magnitude is 50 N, is applied to m, as shown, a) Find the magnitude of the acceleration of the system. b) Determine the magnitude of the contact force between the two blocks. (Hint: The contact force between the two blocks 6. A 500-kg chunk of ice breaks off a glacier and falls 30.0 meters before it hits the water. Assuming it falls freely and there is no air resistance, a) Write down the x and y components of acceleration of the ice. b) What is the magnitude and direction of the net acceleration. c) How long does it take to hit the water? d) Calculate the velocity with which it hits the water. e) What is the magnitude and direction of the force acting on the ice during its fall? 7. The motion of a jet-powered car is shown in the velocity vs time graph below. Jes Car Velocity 250 220 170 160 10 20 30 40 50 60 70 Time, F () (a) Is the acceleration of the car positive, negative and/or zero. (b) If the acceleration is positive, what time to what time on the graph is it positive? (c) If the acceleration is negative, what time to what time on the graph is it negative? (d) If the acceleration is zero, what time to what time on the graph is it zero? (e) Calculate the acceleration of the car at a 25 s by finding the slope of the graph as shown. (f) Based on your understanding of the motion of this car, which of the following is correct? I. The acceleration is constant throughout. II. The acceleration gradually increases until the velocity becomes constant. III. The acceleration gradually deceases until the velocity becomes constant. IV. None of the above