Question

3. A train boxcar traveling in the positive x-direction with a velocity, u 10.00 m/s R, passes directly in front of an observer on a stationary platform. At the precise moment the boxcar passes the observer, a particle is launched from the bottom, left corner of the boxcar with an initial speed, vo' 8.00 m/s at an angle of 0 30.0° above the horitonatal according to an observer on the boxcar (shown below left). Immediately following the launch, the boxcar undergoes constant acceleration in the negative x-direction such that it returns to the platform at the exact time the particle lands at the bottom right corner of the boxcar with final speed v' at an angle of 0,' below the horizontal according to an observer on the boxcar (shown below right). The boxcar passes the platform at this point with velocity. -u. Lu zl vr Assign an xy-axis for both reference frames with the origins at the launch point, the x-direction horizontal and positive to the right and the y-axis positive up. Assume the frames are co-located at the instant the particle is launched. (a) What is the launch speed, vo, and angle above the horizontal for the particle according to the observer on the platform? (b) What is the final speed, v, and angle below the horizontal for the particle according to the observer on the platform? (c) What is the final speed, v', and the angle below the horizontal for the particle according to the observer on the boxcar? (d) What is the length of the boxcar? (e) What is the magnitude of the acceleration of the boxcar during the flight of the particle?

Answer 1