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SAT® Subject Test in Physics

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Moderate

Blue Cart Chasing Yellow Cart

SATPHY-3RTQGN

The diagram below shows a blue cart chasing a yellow cart on a frictionless track. The velocities and masses of the carts are given in the diagram. When the blue cart catches up with the yellow cart, the carts stick together and move as one.

What is the momentum of the two-cart system after the collision?

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A

$3.0 \,(kg)(m)/s$

B

$4.0\, (kg)(m)/s$

C

$5.0 \,(kg)(m)/s$

D

$8.0\, (kg)(m)/s$

E

We do not have enough information to determine the momentum of the two-cart system after the collision.