Mary and Debra Stand on a Snow-Covered Roof

question 92

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 as the snowballs reach the ground below? Neglect the effects of air.(There could be more than one correct choice.)

• A)Debra's snowball will have a higher speed than Mary's snowball.
• B)Mary's snowball will have a higher speed than Debra's snowball.
• C)Both snowballs will hit the ground with the same speed.
• D)Both snowballs hit the ground at the same time.
• E)Mary's snowball reaches the ground before Debra's snowball.

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