In any civil construction work, the use of personal protective equipment, such as helmets, is fundamental. For example, the free fall of a brick with mass $2.5 \mathrm{~kg}$ from a height of 5 m, whose impact against a helmet can last up to $0.5 \mathrm{~s}$, results in an average impulsive force greater than the weight of the brick. Assume that the gravitational acceleration is $10 \mathrm{~m~s}^{-2}$ and that the effect of air resistance is negligible. The average impulsive force generated by this impact is equivalent to the weight of how many equal bricks? (A) 2 (B) 5 (C) 10 (D) 20 (E) 50
In any civil construction work, the use of personal protective equipment, such as helmets, is fundamental. For example, the free fall of a brick with mass $2.5 \mathrm{~kg}$ from a height of 5 m, whose impact against a helmet can last up to $0.5 \mathrm{~s}$, results in an average impulsive force greater than the weight of the brick. Assume that the gravitational acceleration is $10 \mathrm{~m~s}^{-2}$ and that the effect of air resistance is negligible.
The average impulsive force generated by this impact is equivalent to the weight of how many equal bricks?\\
(A) 2\\
(B) 5\\
(C) 10\\
(D) 20\\
(E) 50