Your friend drops your house keys down to you from their second floor window. if you catch them 2.4 m from where your friend dropped them, what is the velocity of the keys when you catch them? a.
-6.9 m/s
c.
-7.2 m/s
b.
-6.5 m/s
d.
-7.4 m/s

The word drop means that the initial velocity of the house keys is 0 m/s. The relationship between the distance and the velocity is given by the equation,
                              2gd = (Vi)² - (Vf)²
where g is the acceleration due to gravity equal to -9.8 m/s². Subsituting the given,
                              2(-9.8 m/s²)(2.4 m) = 0 - (Vf)²
The value of Vf is -6.86 m/s. Thus, the answer is letter A. 

45 is the correct answer

D) the event horizon, a large planet and the chute located between the two.