You push a hockey puck that is initially at rest on slick ice by applying a constant force until the puck reaches a final velocity of 1 m/s. On the second attempt, you want the hockey puck to reach the same final velocity by applying a force that is twice as large. Therefore, you must exert the force for a time interval that is :

a. shorter than the time interval of your first attempt.
b. longer than the time interval of your first attempt.
c. the same as the time interval of your first attempt.