9. a 0.500 kg ball with a speed of 4.0 m/s strikes a stationary 1.0 kg target. the ball and target

stick together. if momentum is conserved, what is the total momentum of the ball and target
after the collision?
a. 0.0 kgm/s
b. 0.5 kgm/s
c. 1.0 kgm/s
d.2.0 kgm/s

Ball bearings are made by letting spherical drops of molten metal fall inside a talll tower-called a shot tower- and solidify as they fall. a-if a bearing needs 4.0 s to solidify enough for impact, how high must the tower be? b- what is the bearing's impact velocity?