Question

На неподвижном плоту находится человек. Масса плота 450 кг, а масса человека 90 кг. Человек прыгает с плота, и его скорость в прыжке равна 2 м/с. Определите скорость, которую приобрел плот в результате взаимодействия. РЕШИТЕ ПОЖАЛУЙСТА!!!

Answer 1

Используем закон сохранения импульса:
m1*V1=m2*V2
V2=m1*V1/m2=90*2/450=0,4 м/с

Answer 2

Calculation of the Velocity Acquired by the Raft

To determine the velocity acquired by the raft as a result of the person jumping off, we can use the principle of conservation of momentum. According to this principle, the total momentum before the jump is equal to the total momentum after the jump.

The momentum of an object is calculated by multiplying its mass by its velocity. Therefore, the momentum of the person before the jump is given by:

Momentum of the person before the jump = mass of the person × velocity of the person before the jump

The momentum of the raft before the jump is given by:

Momentum of the raft before the jump = mass of the raft × velocity of the raft before the jump

Since the person jumps off the raft, their momentum after the jump is zero. Therefore, the total momentum after the jump is equal to the momentum of the raft after the jump. We can use this information to calculate the velocity of the raft after the jump.

Let's calculate the velocities:

Given: - Mass of the raft (m1) = 450 kg - Mass of the person (m2) = 90 kg - Velocity of the person before the jump (v2) = 2 m/s

Using the principle of conservation of momentum, we can write:

Momentum before the jump = Momentum after the jump

(m1 × v1) + (m2 × v2) = m1 × v1'

Where: - v1 = velocity of the raft before the jump - v1' = velocity of the raft after the jump

Rearranging the equation, we can solve for v1':

v1' = [(m1 × v1) + (m2 × v2)] / m1

Substituting the given values:

v1' = [(450 kg × v1) + (90 kg × 2 m/s)] / 450 kg

Now, we need the value of v1, the velocity of the raft before the jump. Unfortunately, the value of v1 is not provided in the question. Therefore, we cannot calculate the exact velocity acquired by the raft without this information.

Please provide the value of v1 (velocity of the raft before the jump) so that we can proceed with the calculation.