申論題

5. As shown in Figure 5, a 20-g bullet is fired at angle of 15° with the horizontal into a 4-kg wooden block and becomes embedded in it. Knowing that the block and bullet then move up the smooth incline of angle 15° for 1.5 seconds before they come to a stop, determine (1) the magnitude of the initial velocity v_o of the bullet,(2) the magnitude of the impulse of the force exerted by the bullet on the block. (22 pts)