JEE Advanced 2020 Full Test 2 Paper 1

Question : 8 of 54

Marks: +1, -0

A solid sphere of mass m is released on the plank of mass M which lies on an inclined plane of inclination θ as shown in figure. There is sufficient frictional force between sphere and plank and the minimum value of co-efficient of friction between plank and surfaces is µ to keep the plank at rest. Then

Frictional force between sphere and plank is ‌
2
7
mg‌sin‌θ, when plank is at rest.
The value of µ is ‌
7M+2m
7(M+m)
‌tan‌θ.
If there is no friction between the plank and inclined plane, then acceleration of plank is less than g‌sin‌θ
If there is no friction between plank and inclined plane, then friction force on the sphere is zero.

Validate

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