A system consists of two cubes of masses m 1 and m 2 respectively connected by a spring of force constant k. The force (F) that should be applied to the upper cube for which the lower one just lifts after the force is removed is-
A
m 1 g
B
C
(m 1 + m 2 ) g
D
m 2 g
Text Solution
Verified by ExpertsThe correct answer is:
C
Initially, F = m 1 g = k 1 x 1
x 1 = 
.... (1)
Finally, x 2 = 
.... (2)
From conservation of energy,
m 1 g (x 1 + x 2 ) = 
k 
.... (3)
From (1), (2) & (3), F = (m 1 + m 2 ) g
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