A ball is thrown downward from the top of a building with an initial speed of 25 m/s. It hits the ground in 2.0 s. How high is the building?
A) 70 m
B) 50 m
C) 30 m
D) 20 m

Question

Quizplus · Accepted Answer

The height of the building can be calculated using the equation of motion: $h = v_0 t + \frac{1}{2} g t^2$, where $v_0$ is the initial velocity (25 m/s), $g$ is the acceleration due to gravity (approximately 9.8 m/s$^2$), and $t$ is the time (2.0 s). Plugging in the values: $h = 25 \times 2 + \frac{1}{2} \times 9.8 \times 2^2 = 50 + 19.6 = 69.6$ m, which rounds to 70 m.

A Ball Is Thrown Downward from the Top of a Building