Would would have moved a total distance of 2k, because walking is a slower speed does not change distance
Answer:
The time is 
The speed is 
Explanation:
From the question we are told that
The height of the cliff is 
Generally from kinematic equation we have that

before the jump the persons initial velocity is u = 0 m/s
So

=> 
Generally from kinematic equation

=> 
=> 
KE = 1/2mv^2
KE= 1/2(2)(5)^2
KE= 25 J