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Principle of conservation of the mechanical energy 

 Em= x+ Ep

In absence of drag forces, then the mechanical energy is conserved throughout all the situations. 

Stage 1
(drawing) 

(explanation of drawing) 

Stage 2 12m

& latit

( Ensz= ecran sith, Bom

½ Natomis

E

t.s .. S2 hz

12=

Em= Ek& Ep - Ey EES

Em- 72. 25.0²+ 25 9,8.30 vo

= 7350 g

Em2= 73502

be En3= 73500

)

due to

principle

of conversation& the

rrectenicel enersy

When we have no friction.

force

Emz Ex3+ Ep3

1

W+

Z.mygt mghz

1

을: 25. V? +25.9,3.0

1.25.vto= 7350D

ly 2= 7350

12,5