A ball is thrown upward with an initial velocity of 12m/when the ball rises to 19m above its starting point, its velocity is 3m/s reaches its peak and comes back down to 19m above the starting point. What is its velocity now. a.-12m/s
b.12m/s
c.-3m/s
d.3 m/s

During the apollo moon missions, astronauts were concerned about the effects of newton's third law of motion when: o a. they ejected waste water, because they were concerned that it would push them off course. o b. they reentered earth's atmosphere, because they were carrying heavy moon rocks. o c. they took off from earth, because a large force was required to generate large acceleration. o d. they detected incoming space debris, because the inertia of the debris could damage their ship.