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a 7.40e04 kg wagon is on top of a frictionless hill. the initial position H1 has...

a 7.40e04 kg wagon is on top of a frictionless hill. the initial position H1 has a height of 5.80 m and the lower successively lower positions H2 and H3 have heights of 3.40m and 1.50 m respectively.
a.) the wagons speed at H2 (in m/s)
b.) the wagons speed at H3 (in m/s)
c.) The work done by the gravitational Force on the wagon as it moves from each one to H3 (in J)?
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Answer #1

a)

By Conservation of energy between points 1 and 2

Since wagon starts from rest V1=0

b)

By Conservation of energy between points 1 and 3

Since wagon starts from rest V1=0

c)

Work done by gravitational force as wagon moves to point 3 is

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