PFY p.121
A)50x10=500N
b)GPE=mgh
=50x10x4 = 2000J
c)KE= 1/2m v^2
2000=25 x v^2
80J=v^2
Collins, p.91
Q3: a) GPE=mgh
=35 x 10 x 30
= 10500J
B) KE=1/2m v^2
10500=1.5 x v^2
600J=v^2
c) Because there is friction between the sledge and the ice (=heat energy)
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