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mandy9008
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Homework Statement
A object of mass 3.00 kg is subject to a force Fx that varies with position as in the figure below.
Find the work done by the force on the object as it moves as follows:
(a) from x = 0 to x = 4.00 m
(b) from x = 5.00 m to x = 10.0 m
(c) from x = 11.0 m to x = 15.0 m.
(d) If the object has a speed of 0.500 m/s at x = 0, find:
speed at x = 5.00 m
speed at x = 15.0 m
The Attempt at a Solution
a. W=2.5N (4m) / 2 = 5J
b. W=3N (5m) = 15J
c. W=2.5N (4m) / 2 = 5J
d. W=1/2 mv2 - 1/2 mvo2
x=5m 15J = 3kg v - (3kg)(0.500m/s)
v=2.29 m/s
x=15m 0=3kg v - (3kg)(0.500m/s)
v=0.5 m/s
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