Two blocks A and B each of 20 kg lying on a frictionless table are connected by a light string. The system is pulled horizontally with an acceleration of ` 2 ms ^ ( - 2 ) ` by a force F on B. The tension in the string will be

Options

A. 10 N
B. 40 N
C. 100 N
D. 120 N

Answer

B

Explanation

The given situation can be shown as

The tension `T = M _ A xx a `
here, ` M _ A = 20 kg and a = 2 ms ^( -2 ) `
` T = 20 xx 2 = 40 N `