Please help me . (1)- A gun is fired vertically into a 1.4 kg block of wood at rest directly above it. If the bullet has a mass of 21 g and a speed of 310 m/s, how high will the block rise into the air after the bullet becomes imbeded in it ? (2)- A rocket of total mass 3700 kg is traveling in outer space with a velocity of 110 m/s toward the Sun. It wishes to alter its course by 35 degrees, and can do this by firing its rocket briefly in a direction perpendicular to its original motion. If the rocket gases are expelled at a speed of 1900 m/s, how much mass must be expelled ?