Question

In the figure given below, all surfaces are assumed to be smooth and the force F = 100N. If acceleration of block B of mass 20kg is 'a' and tension in string connecting block A of mass 20 kg is T then just after when the force F is applied .

• A. T =0 and a = 5m/s²
• B. T = 100 N and a = 0
• C. T = 200 N and a =5m/s²
• D. None

Answer 1

Answer: (A)

T =0 and a = 5m/s²

Answer 2

As there is no friction, horizontal force on B is therefore F = 100 N

\ a = $\frac { 100 } { 20 }$ = 5m/s²

but no horizontal force on A acts therefore T = 0