1) A man standing on the roof of a building 30 m high throws a ball vertically downward with an initial velocity 5 m/s as it leaves his hand. a) What is the velocity of the ball after it has been falling for 0.5 second? b) How far will it be after 1.5s? c) What will be its velocity as it strikes the ground? d) If the ball was released from the top of the roof, in how many seconds will it strike the ground? 2) A ball is thrown vertically upwards from the ground with an initial speed of 80 ft/s. a) How long will it take to rise to its highest point? b) How high does the ball rise? c) How long after projection will the ball have a velocity of 16 ft/s upward? d) Of 16 ft/s downward? When is the magnitude of the ball's velocity equal to +48 ft/s after projection?