Inside a horizontal moving box, an experimenter finds that when an object is placed on a smooth horizontal table and is released, it moves with an acceleration of `10ms^(-2)`, in this box. If 1-kg body is suspended with a light string. The tension in the string in equilibrium position. (w.r.t. experimenter) will be (take `g=10ms^(-2)`)

Options

A. 10 N
B. `10 sqrt(2) N`
C. 20 N
D. zero

Answer

B

Explanation

Acceleration of box `= 10 m//s_(2)`
Inside the box forces acting on bob are shown in the figure
`T = sqrt((mg)^(2)+(ma)^(2))=10 sqrt(2)N`