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 gravity as 10ms^2)
A
5J
B
25J
C
250J
D
500J
E
625J
Verified Correct Answer: D.
Physical Principles & Numerical Solution
v2 = u2 + 2gh = 0 + 2 x 10 x 10
v2 = 200; K.E = 1/2mv2 = 1/2 x 5 x 200 = 500J
Source: Myschool Past Questions Archive (Record #24253)