Arock is dropped from a height of 2.5 meters. what is its velocity when it reaches the ground?
a.3.5 meters/second
b.7.0 meters/second
c.12 meters/second
d.14 meters/second
e.49 meters/second

We know, v² - u² = 2as
Here, u = 0   [ Free fall ]
a = 9.8 m/s² [ Constant value for Earth System ]
s = 2.5 m

Substitute their values, 
v² - 0 = 2 * 9.8 * 2.5
v² = 49
v = √49
v = 7 m/s

In short, Your Answer would be Option B

Hope this helps!

W0lf93. energy flows from the producer level to the consumer level.

B, if it was a lower watt she could put it in for her normal time and not burn it