The potential energy of a particle of mass m free to move along x-axis is given by U = 
kx 2 for x < 0 and U = 0 for x 
0 (x denotes the x-coordinate of the particle and k is a positive constant). If the total mechanical energy of the particle is E, then its speed at x = – 
is
A
zero
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
From conservation of energy
K.E. + P.E. = E or K.E. = E – 
kx 2
K.E. at x = – 
is
E – 
k 
= 0
The speed of particle at x = – 
is zero.
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