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SAT Subject Test

An object with mass and speed directed to the right strikes a wall and rebounds with speed directed to the left.

The change in the object's momentum is

### Select an Answer

directed to the left

Correct Answer:

Yes

directed to the left

Correct Answer:

No

Correct Answer:

No

directed to the right

Correct Answer:

No

directed to the right

Correct Answer:

No

### View Correct Answer

The change in the object's momentum is directed to the left. Momentum is a vector quantity. Its magnitude for an object of mass and speed is . Taking the positive direction to be to the right (the initial direction of the object), the object has momentum before striking the wall and momentum afterward. The change in momentum is the final value minus the initial value:

This is a change of magnitude directed to the left.

Question Difficulty:

hard