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A 1120 kg car traveling initially with a speed of 27.40 m/s in an easterly direction crashes into the back of a 9 490 kg truck moving in the same direction at 20.0 m/s. The velocity of the car right after the collision is 18.0 m/s to the east. (a) What is the velocity of the truck right after the collision?

Respuesta :

Chenk13

Answer:

41.5 m/s

Explanation:

Since there are no external forces, momentum must be conserved.

Momentum P = mv.

Total momentum before the collision:

[tex]P = m_{car}v_{car} + m_{tru}_{ck}v_{tru}_{ck} = 1120 * 27.4 + 490 * 20 = 40.488[/tex]

Total momentum after the collision:

[tex]P = 1120 * 18 + 490 * v_{tru}_{ck} = 40.488[/tex]

solving for v:

[tex]v_{truck} = 41.5[/tex]

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