Mary and Debra Stand on a Snow-Covered Roof

question 19

Multiple Choice

Mary and Debra stand on a snow-covered roof.They both throw snowballs with the same initial speed,but in different directions.Mary throws her snowball downward,at 30° below the horizontal;Debra throws her snowball upward,at 30° above the horizontal.Which of the following statements are true about just before the snowballs reach the ground below? (There could be more than one correct choice. )

• A)Debra's snowball will stay in the air longer than Mary's snowball.
• B)Mary's snowball will stay in the air longer than Debra's snowball.
• C)Both snowballs will take the same amount of time to hit the ground.
• D)Debra's snowball has exactly the same acceleration as Mary's snowball.
• E)Mary's snowball has a greater downward acceleration than Debra's snowball.