A225 kg red bumper car is moving at 3.0 m/s. it hits a stationary 180kg blue bumper car. the red and blue bumped cars combine and hit a stationary green bumper car of mass 150kg. the red, blue and green bumper cars all combine. what is the final velocity of the combined bumper cars?

1.22 m/s

Explanation:

By using the conservation of momentum of red and blue car

225 x 3 + 180 x 0 = (225 + 180) v

Where, v be the speed of blue and red car combined together.

675 = 405 v

v = 1.667 m /s

now the conservation of momentum for blue red combination and green car

(225 + 180) x 1.667 = (225 + 180 + 150) v'

Where v' is the speed of combined cars

675 = 555 v'

v' = 1.22 m/s

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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