Question

You throw a water balloon downward from the roof of a building at a speed of 3.5 m/s. How fast will the balloon be moving when it hits the sidewalk 8.0 m below?
a.
13 m/s
c.
160 m/s
b.
12.7 m/s
d.
169 m/s

Answer 1

vf^2 = v0^2 + 2a * deltax

v0 is the initial velocity (3.5 m/s), a is the acceleration due to gravity (9.81 m/s/s) and delta x is the distance travelled (8.0m). Plug in the appropriate quantities and evaluate vf, the final velocity.