Question

29. A boy dropped an object of mass 200g from a tower 100m high.
The object fell on the surface of the earth. The boy analysed
his observation. The boy made use of the principle of
conservation of momentum and calculated the velocity, K.E. and momentum of the object. Based on the information and using the principle of energy conservation, answer the following questions.
(i) The total energy of the object just before dropping is
(a) 200J
(b) 200000" (c) 20J (d) None (1)
The final K.E. of the object just before touching the
ground is
(a) 20J (b) 200000J (c) 2003 (d) None

Answer 1

Answer:

a 200 J

d none

Explanation:

total ke =mgh +1mv^2/3

where v =o