CoE questions

19. a) W= mg= 50*10= 500N
b) GPE= wh= 500*4= 2000 J
c) GPE=KE=2000 J

3. a) GPE= mgh= 30*35*10=10500 J
b) KE= GPE
10500= 0.5mv2
v2= 600
v=24.5 m/s

c) Not all of the GPE is transferred to KE because some energy is wasted due to friction.

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