Grade 11Mechanics
question 51 of chapter 9 centre of mass and collision
question 51 of chapter 9 centre of mass and collision
1 Answer
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Approved Tutor Answer8 Years agoIf both the blocks are pulled by some force, they suddenly move with some acceleration and
instantaneously stop at same position where the elongation of spring is maximum.
Let x1, x2 extension by block m1 and m2
Total work done = Fx1 + Fx2
instantaneously stop at same position where the elongation of spring is maximum.
Let x1, x2 extension by block m1 and m2
Total work done = Fx1 + Fx2
Increase the potential energy of spring = (1/2) K (x1+ x2)2 …(2)
Equating (1) and (2)
F(x1 + x2) = (1/2) K (x1+ x2)2 (x1+ x2) =
K
2F
Since the net external force on the two blocks is zero thus same force act on opposite direction.
m1x1 = m2x2 …(3)
And (x1+ x2) =
K
2F
F(x1 + x2) = (1/2) K (x1+ x2)2 (x1+ x2) =
K
2F
Since the net external force on the two blocks is zero thus same force act on opposite direction.
m1x1 = m2x2 …(3)
And (x1+ x2) =
K
2F
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