10. A positive linear impulse can only increase a jumper's velocity.

True

false

11. If a runner is slowing down after crossing the finish line, the impulse is

Parallel to her direction of travel

Perpendicular to her direction of travel

Opposite to her direction of travel

Unknown, since the sum of all forces is unknown

12. The negative impulse experienced by an athlete executing a vertical jump is due to

Gravity

Mass

Weight

Time in the air

landing