A 5 kg block rests on horizontal surface. Which of the following option is correct?  $(\mathrm{g}=10\mathrm{m}\text{/}{\mathrm{s}}^2)$

Solution:

• Weight of block, W = m × g = 5 kg × 10 m/s² = 50 N (downward)
• The surface exerts an equal and opposite normal reaction, N = 50 N (upward)
• The net force on the block is zero, so it remains at rest on the surface.

Correct Option:

The normal reaction by the surface on the block is 50 N upward.