A body of mass 5kg falls from a height of 10m above the ground. What is the kinetic energy of the body just before it strikes the ground? (Neglect energy losses and take gas 10ms2)
-
A.
5J -
B.
25J -
C.
250J -
D.
500J -
E.
625J
Correct Answer: Option D
Explanation
v2 = u2 + 2gh = 0 + 2 x 10 x 10
v2 = 200; K.E = 1/2mv2 = 1/2 x 5 x 200 = 500J