Question 19. A bullet (mb = 0.050 kg) is traveling horizontally when it hits and embeds itself into a wooden block (mwb = 0.600 kg) that slides on a frictionless track. At the end of the track, there is a spring attached to a wall. The wooden block runs into the wall, and compresses the spring a distance of 0.15 m before stopping. The spring constant of the spring is 2500 N/m. What was the initial speed of the bullet? 9.3 m/s 19 m/s 60 m/s 120 m/s 580 m/s