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12-3. From approximately what floor of a building must a
Chapter 12, Problem 12-3(choose chapter or problem)
12-3. From approximately what floor of a building must a car be dropped from an at-rest position so that it reaches a speed of 80.7 ft/s (55 mi/h) when it hits the ground? Each floor is 12 ft higher than the one below it. (Note: You may want to remember this when traveling 55 mi/h.)
Questions & Answers
QUESTION:
12-3. From approximately what floor of a building must a car be dropped from an at-rest position so that it reaches a speed of 80.7 ft/s (55 mi/h) when it hits the ground? Each floor is 12 ft higher than the one below it. (Note: You may want to remember this when traveling 55 mi/h.)
ANSWER:Step 1 of 3
From Newton’s laws of motion,we know that:
Where is the final velocity of the car and is given as
is the initial velocity and is given as
is the displacement of the car,
And acceleration a will be acceleration due to gravity, which can be taken as