contestada

A 7500 kg open train car is rolling on frictionless rails at 25.0 m/s when it starts pouring rain. A few minutes later, the car's speed is 20.0 m/s. What mass of water has collected in the car?

Respuesta :

Answer:

Mass of rain collected will be 1875 kg

Explanation:

We have given mass of the train [tex]m_i[/tex] = 7500 kg

Velocity of the car [tex]v_i[/tex] = 25 m/sec

After few minutes velocity of the car = 20 m/sec

From conservation of momentum we know that [tex]m_iv_i=m_fv_f[/tex]

So [tex]7500\times 25=m_f\times 20[/tex]

[tex]m_f=9375kg[/tex]

[tex]m_f[/tex] will be sum of mass of car and mass of rain collected

As mass of car is 7500 kg

So mass of rain collected = 9375 - 7500 = 1875  kg

Otras preguntas