Wednesday, 14 September 2011

Questions

PFY pg. 121

19. a) W= m x g
W = 50 x 10
W = 500 N

b) GPE = mgh
GPE = 50 x 10 x 4 GPE = 2000J


total energy at the beginning = total energy at the start c) KE = 2000J

collins pg. 91

Q3: a) GPE = mgh
GPE = 35 x 10 x 30 GPE = 10, 500J KE = 1/2 x 35 x v squared 10,500 = 1/2 x 35 v squared b) V 2= 600
V= 24.5 m/s c) friction

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