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

a. 13 m/s

Step-by-step explanation:

Given: You throw a water balloon downward from the roof of a building at a speed of 3.5 m/s.

To Find:  How fast will the balloon be moving when it hits the sidewalk 8.0 m below.

Solution:

Height of roof from sidewalk

initial speed with which water balloon was thrown

we know that,

second equation of motion

as balloon is descending downwards

putting values

≅

hence, the speed of balloon when it hits the sidewalk is , correct option is a.