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mrs_skeptik [129]

3 years ago

12

A 225 kg red bumper car is moving at 3.0 m/s. It hits a stationary 180 kg blue bumper car. The red and blue bumper cars combine

and hit a stationary green bumper car of mass 150 kg. The red, blue, and green bumper cars all combine.
A. 0.93 m/s
B 1.2 m/s
C 1.7 m/s
D 2.7 m/s

2 answers:

GuDViN [60]3 years ago

8 0

Answer:

B. 1.2m/s

Explanation:

as per the law of conservation of momentum,

initial momentum= final momentum

considering collision 1 : Mr * Vr + ( Mb * Vb) = ( Mr + Mb ) Vrb

where Vrb is the final velocity after 1st collision with which red and blue car moves.

therefore, 225* 3 + 0 = ( 225 + 180 ) Vrb

Vrb = 675/405

= 1.67m/s

now collision 2 : ( Mr+ Mb) Vrb + MgVg= ( Mr+ Mg+ Mb ) V'

where V' is the total speed

675 + 0 = 555V'

V' = 675/555

= 1.2 m/s

klemol [59]3 years ago

6 0

I think the answer for the question above its b 1.2

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