During the construction of a high-rise building, a worker accidentally dropped his portable electric screwdriver from a height of 144 ft. After t sec, the screwdriver had fallen a distance of ft.
What was the velocity of the screwdriver at the time it hit the ground?

A) 12 ft/sec
B) 48 ft/sec
C) 768 ft/sec
D) 96 ft/sec

Question

During the construction of a high-rise building, a worker accidentally dropped his portable electric screwdriver from a height of 144 ft. After t sec, the screwdriver had fallen a distance of  ft. ​
What was the velocity of the screwdriver at the time it hit the ground?
​
A) 12 ft/sec 
B) 48 ft/sec 
C) 768 ft/sec 
D) 96 ft/sec

Quizplus · Accepted Answer

We can use the formula for the velocity of an object in free fall, which is v = sqrt(2gh), where g is the acceleration due to gravity (32 ft/sec^2) and h is the height from which the object was dropped. Plugging in h = 144 ft, we get:
v = sqrt(2(32)(144)) = 96 ft/sec
Therefore, the correct answer is D).

During the Construction of a High-Rise Building, a Worker Accidentally