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A box of mass 10 kg is lowered with a do...

A box of mass 10 kg is lowered with a downward acceleration `4 m//s^(2)` . In the box there is a spring whose lower end is fixed to the box and a ball of mass kg is kept on its loose end, as shown below. At a certain instant when the spring (spring constant `= 100 N//m`) is found to be compressed by `5 cm`, tension in the cable `T` is :

A

`65N`

B

`61N`

C

`60N`

D

`100N`

Text Solution

Verified by Experts

The correct Answer is:
A
A box of ……………..

`FBD` of the box is shown above. Writing Newton's second law.
`105 - T = 10(4)`
`T = 65 N`
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