CoE questions

PFY p.121

19 

a) W = m x g       50 x 10 = 500 newtons

b) GPE= m x g x h     50 x 10 x 4 = 2000 joules

c) GPE = KE      2000 joules

Collins, p.91

Q3

a) GPE= m x g x h      GPE = 35 x 10 x 30      GPE= 10500 joules

b) KE = 1/2 mv^2    10500 = 1/2 x 35 x v^2      V= 24.5m/s

c) There is energy lost due to friction as heat.