Question

please help me answer this.. i do not have much time​

Answer 1

Law of conservation of energy states that:−
Energy can neither be created nor be destroyed.
Energy transforms from one form to another form and, potential energy+ kinetic energy= constant
Proof:−
At point A
K.E=0 m/s
P.E=mgh
At point B,
K.E.,
2gh=V^2-0^2
V^2=2gx
K.E=1/2m(V)^2
K.E=1/2m.2gx
K.E=mgx————— 1
P.E=mgh
P.E=mg(h-x)
P.E=mgh-mgx ————- 2
From 1 and 2
K.E+P.E=Constant
mgx+mgh-mgx=mgh
mgh=mgh
At point C
P.E=0
2gh=v^2-u^2(Initial velocity=0 m/s)
2gh=v^2
K.E=1/2*m*v
K.E=1/2*m*2gh
K.E=mgh
Thus,in all points the energy is same