Mary and Debra Stand on a Snow-Covered Roof

question 138

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? Neglect the effects of air.(There could be more than one correct choice.)

• A)Debra's snowball will stay in flight longer than Mary's snowball.
• B)Mary's snowball will stay in flight 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.

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