A strip of wood of mass M and length l is placed on a smooth horizontal surface. An insect of mass m starts at one end of the strip and walks to the other end in time t, moving with a constant speed.
A
The speed of the insect as seen from the ground is < 
.
.
B
The speed of the strip as seen from the ground is 
.
.
C
The speed of the strip as seen from the ground is 
.
.
D
The total kinetic energy of the system is 
.
.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, c)
mv 1 = Mv 2 , where v 1 and v 2 are speeds of m and M, as seen from ground.
The velocity of m relative to M is
v 12 = v 1 – (-v 2 )
Hence, t = 
or v 1 + v 2 = l/t.
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