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

From the given problem above, the correct answer would be option A. 13 m/s. Here's how it is solved. Equation Vf( Final Velocity) = Square root of Vo^2 ( initial velocity) + 2(9.81)(8m) = 12.97m/s round it up to 13m/s. Therefore, if the balloons will be moving and it hits the sidewalk 8.0m below, then it is 13 m/s fast.

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.

answer:

option d, is the right equation.