JEE Advanced 2020 Full Test 4 Paper 1

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Question : 10 of 54

Marks: +1, -0

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 on the strip and walks to the other end in time t, moving with a constant speed.

the speed of the insect as seen from the ground is <‌
ℓ
t
.
the speed of the strip as seen from the ground is ‌
ℓ
t
(‌
M
M+m
)
the speed of the strip as seen from the ground is ‌
ℓ
t
(‌
m
M+m
)
the total kinetic energy of the system is ‌
1
2
(m+M)(‌
ℓ
t
)2

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