Vertical Motion Worksheet ... A frightened cat jumps straight into the air with an initial vertical velocity of 14 feet ... Answers on back. Worked-ou...
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Formula if something is dropped instead of thrown:
_______________________
Answers on back. Worked-out solution key online.
Explain why the formula changes when an object is dropped and not thrown:
Identify what the following variables represent in the formulas:
1)
h = ________________
t = ________________ (unit: _______________)
s = ________________
v = ________________ (unit: _______/________)
A measuring tape drops from a roof that is 16 feet above the ground. After how many seconds does the measuring tape land on the ground?
______________ 2) Mrs. Wood forgot her car keys, so she called up to her friend to drop her keys out the window 75 feet above the ground. If Mrs. Wood’s hand is 3 feet above the ground when she catches is, how long does it take for her to receive her keys?
______________ 3) A frightened cat jumps straight into the air with an initial vertical velocity of 14 feet per second. How long will it take for the cat to reach the ground again?
______________
4) A cherry falls from a tree branch that is 9 feet above the ground. A) What is the height of the cherry after 0.2 seconds? ______________ B) After how many seconds does the cherry hit the ground?
______________ 5) A red ball is kicked upward from the ground with an initial vertical velocity of 44 feet per second. A green ball is kicked upward from the ground with an initial vertical velocity at 40 feet per second. A) Which ball is in the air for more time? B) How much more time is it in the air than the other?
A) ______________ B) ______________ 6) A man throws a ball into the air, releasing it from a height of exactly 7 feet with an initial velocity of 54 feet per second. How long will it take the ball to hit the ground?
______________ 7) While throwing a temper tantrum, an angry toddler standing on a chair screams and throws his ice cream cone into the air from 5 feet above the ground with an initial vertical velocity of 30 feet per second (he’s pretty strong!). How long does it take before the cone hits his baby brother’s head 1 foot above the ground?
______________
ANSWERS: 1) 1 second 5) A) the red ball
2) 2.1 seconds 3) 7/8 of a second 4) A) 8.4 feet B) ¾ of a second B) 1/4 of a second longer 6) 31/2 seconds 7) 2 seconds
