[sarahlee]

Rowan and jean are tobogganing on an old pasture with rolling hills. At A the hill is 14m high; at B, 2.8m, at A, the toboggan is just beginning to slide.
a)if there is no loss of mechanical energy, what is the velocity of the toboggan at B?
b) if 25% of the mechanical energy at A is lost by B, what is the velocity of the toboggan at B?:eek:

[your_missing]

a) by the law of conservation of energy,
v*v = sqrt 2gh
= sqrt 2(9.8)(14-2.8)
=14.82 m/s