Question

A block is lying on an inclined plane which makes ${60}^o$ with the horizontal. If coefficient of friction between block and plane is 0.25 and g=10 $m/s^2$, then acceleration of the block when it moves along the plane will be

• A. 2.50 m/s2
• B. 5.00 m/s2
• C. 7.4 m/s2
• D. 8.66 m/s2

Answer 1

The correct option is C

7.4 m/s2

$a=g(sin\theta -\mu cos\theta )=10(sin{60}^o-0.25cos{60}^o)$
$a=7.4m/s^2$