Question

Цвях падає з даху п'ятиповерхового будинку (висота 18м) з прискоренням 9, 8M / (c ^ 2) . Якою буде швидкість цвяха у момент падіння на землю? Даю 20 балів це дуже терміново

Answer 1

Ответ: 18,7 м/с

Объяснение:

V=√2gh

g-прискорення

h-висота

Answer 2

Calculation of the Nail's Speed at the Moment of Impact

To calculate the speed of the nail at the moment it hits the ground, we can use the equations of motion. The nail falls from a height of 18 meters with an acceleration of 9.8 m/s^2. We need to find the final velocity (speed) of the nail when it reaches the ground.

We can use the following equation of motion to solve for the final velocity:

v^2 = u^2 + 2as

Where: - v is the final velocity (speed) of the nail - u is the initial velocity of the nail (which is 0 m/s as the nail starts from rest) - a is the acceleration due to gravity (which is -9.8 m/s^2 as it acts in the opposite direction to the motion of the nail) - s is the displacement of the nail (which is -18 m as it falls downwards)

Substituting the given values into the equation, we get:

v^2 = 0^2 + 2(-9.8)(-18)

Simplifying the equation further:

v^2 = 352.8

Taking the square root of both sides to solve for v:

v = √(352.8) ≈ 18.77 m/s

Therefore, the speed of the nail at the moment it hits the ground will be approximately 18.77 m/s.

Please note that this calculation assumes no air resistance and that the acceleration due to gravity remains constant throughout the fall.