Question

Block is pushed from bottom of inclined plane with speed 6 m/s as shown in figure, find time after which the block will return to the initial position?

• A. t=4.2 s
• B. t=3.6s
• C. t=12.8 s
• D. Block will not return

Answer 1

The correct option is D Block will not return

When block stops


$mgsin\theta =8\times 10\times$ $\frac{3}{5}$
=48

$f_{max}={\mu }_{s}N={\mu }_{s}mgcos\theta =0.8\times 8\times 10\times \frac{4}{5}$

=$0.8\times 32\times 2$

=$0.8\times 64=51.2$

$\Rightarrow$ block will stop & not return