Question

A block is placed on a rough horizontal plane. A time dependent horizontal force $F=kt$ acts on the block. Here $k$ is a positive constant. Acceleration-time graph of the block is

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

Block starts sliding when $k{t}_0=\mu mg$

When $t\le t_0,a=0$
and when $t>t_0,a=\frac{F-\mu mg}{m}=\frac{kt}{m}-\mu$