Question

9 клас. Снаряд масою 40 кг, що летить зі швидкістю 750 м/с, потрапляє у нерухомий вагон, навантажений піском і застряє в ньому. Вагон внаслідок цього почав рухатись зі швидкістю 1,2 м/с. Яка маса вагона?​

Answer 1

Ответ:

mв=24960 кг

Объяснение:

Не знаю правильно, чи ні. Але сподіваюсь що наштовхнула тебе на правильну думку)))

Answer 2

To find the mass of the wagon, we can use the principle of conservation of momentum. According to this principle, the total momentum before the collision is equal to the total momentum after the collision.

Conservation of Momentum:

The momentum of an object is given by the product of its mass and velocity. Mathematically, momentum (p) is defined as:

p = m * v

Where: - p is the momentum - m is the mass of the object - v is the velocity of the object

Before the collision, the momentum of the projectile is given by:

p1 = m1 * v1

Where: - m1 is the mass of the projectile (40 kg) - v1 is the velocity of the projectile (750 m/s)

After the collision, the momentum of the combined system (projectile + wagon) is given by:

p2 = (m1 + m2) * v2

Where: - m2 is the mass of the wagon (unknown) - v2 is the velocity of the combined system after the collision (1.2 m/s)

Since the total momentum before and after the collision is the same, we can equate the two equations:

p1 = p2

m1 * v1 = (m1 + m2) * v2

Now we can solve for the mass of the wagon (m2):

m2 = (m1 * v1 - m1 * v2) / v2

Substituting the given values:

m2 = (40 kg * 750 m/s - 40 kg * 1.2 m/s) / 1.2 m/s

Calculating this expression will give us the mass of the wagon.