- #1
missrikku
Hello again! I just want to check if this is correct..
A 1.5 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the pos direction of 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 m 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
Wouldn't I get the same answer for both a and b?
I did the following:
** S = integral sign
W = S F(x)dx = Kf - Ki
with xi = 0 and xf = 2.0:
S F(x)dx = 2.5x -x^3/3 --> 2 1/3 J
Wouldn't the ans for both a and be be 2 1/3 J?
Thanks!
A 1.5 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the pos direction of 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 m 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
Wouldn't I get the same answer for both a and b?
I did the following:
** S = integral sign
W = S F(x)dx = Kf - Ki
with xi = 0 and xf = 2.0:
S F(x)dx = 2.5x -x^3/3 --> 2 1/3 J
Wouldn't the ans for both a and be be 2 1/3 J?
Thanks!