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nchin
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Question about maximum Kinetic Energy?? KE & Work problem??
A 1.5 kg block is initially at rest on a horizontal frictionless surface when a horizontal force along an x-axis
is applied to the block. The force is given by F(x) = (2.5 - x^(2))i N, where x is in meters and the initial position of the
block is x = 0.
a) What is the kinetic energy of the block as it passes through x = 2.0 m ?
b) What is the maximum kinetic energy of the block between x = 0 and x = 2.0 m ?
I understand how to solve a but its part b that confuses me.
Solution Guide states:
"KE is maximized when F = 0.
F = 0 when 2.5 - x^(2) = 0
x = √ 2.5 = 1.6 m
Thus KE is maximized at x = 1.6 m "
But why is KE maximized when F = 0?? Someone please explain to me.
Thanks!
A 1.5 kg block is initially at rest on a horizontal frictionless surface when a horizontal force along an x-axis
is applied to the block. The force is given by F(x) = (2.5 - x^(2))i N, where x is in meters and the initial position of the
block is x = 0.
a) What is the kinetic energy of the block as it passes through x = 2.0 m ?
b) What is the maximum kinetic energy of the block between x = 0 and x = 2.0 m ?
I understand how to solve a but its part b that confuses me.
Solution Guide states:
"KE is maximized when F = 0.
F = 0 when 2.5 - x^(2) = 0
x = √ 2.5 = 1.6 m
Thus KE is maximized at x = 1.6 m "
But why is KE maximized when F = 0?? Someone please explain to me.
Thanks!