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.

step-by-step explanation:

y = | -2(-2) |     →     y = | 4 |     →     y = 4       ⇒   (-2, 4)

y = | -2(-1) |     →     y = | 2 |     →       y =   2       ⇒   (-1, 2)    

y = | -2(0) |     →     y = | 0 |     →       y = 0         ⇒   (0, 0)

y = | -2(1) |   c →     y = | -2 |     →     y =   2         ⇒   (1, 2)    

y = | -2(2) |     →     y = | - 4 |     →     y =   4         ⇒   (2, 4)