4. edna stands at the top of a tall cliff. she throws a stone upwards with an initial speed of 15 m/s. she then throws
a stone downwards with the same speed. both stones strike the ground below at the same location. neglecting air
resistance, which statement below is true?
a the stone thrown down will hit the ground with the greatest velocity.
b. the stone thrown up will hit the ground with the greatest velocity.
c. both stones will strike the ground with the same velocity.
d. both stones will strike the ground after being in the air the same amount of time.