A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s 2 . The ball is referred to at the two-second time. The distance the ball is below the rooftop in meters is
A) 0.
B) 4.9.
C) 9.8.
D) 19.6.
E) none of these.

Question

A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s 2 . The ball is referred to at the two-second time.  The distance the ball is below the rooftop in meters is
A) 0.
B) 4.9.
C) 9.8.
D) 19.6.
E) none of these.

Quizplus · Accepted Answer

Using the formula d = 1/2at^2, where d is the distance, a is the acceleration due to gravity (-9.8 m/s^2 since it's pulling down), and t is the time (2 seconds in this case), we get d = 1/2*(-9.8)*(2)^2 = -19.6 meters. However, since distance cannot be negative, we take the absolute value and get 19.6 meters. Therefore, the ball is 19.6 meters below the rooftop after two seconds.

A Ball Is Dropped from a Rooftop of a Building