Question

a block of mass 5kg is placed on a rough horizontal surface the coefficient of friction between block and surface is u=0.5. when a horizontal force of 30N is applied on the block then acceleration of block is (g=10m/s^2)​

Answer 1

Explanation:

If the floor is in rectangular shape

Then your answer is,

Perimeter of rectangle =2(l+b)

18=2(l+b)

Then,

Area \: of \: four \: walls =2(l+b) \times hAreaoffourwalls=2(l+b)×h

Area \: of \: four \: walls=18 \times 3Areaoffourwalls=18×3

Area \: of \: four \: walls =54m²Areaoffourwalls=54m²