Answer:
Explanation:
Area of trapezoid =[(2 + 38) / 2 ] x 2 = 40 sq m .
Pressure at the centre of the trapezium
= h d g = 1 x 10³ x 9.8 N / m² ( height of centre is 1 m )
= 9800 N /m²
Total force required = pressure at the centre x total area
9800 x 40 = 392 x 10³ N.
