You push a hockey puck that is initially at rest on slick ice by applying a cons

Question

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 shorter than the time interval of your first attempt. longer than the time interval of your first attempt. the same as the time interval of your first attempt. After the hockey puck has reached the final velocity, you suddenly stop pushing it. The hockey puck: stops abruptly reduces speed gradually continues at constant velocity increases speed gradually reduces speed abruptly

Explanation / Answer

1) since force is doubled , acceleration will be doubled

v = u + at

so the force has to be applied for a shorter duration

option a) is the correct answer

2) when we stop pushing it a = 0

v = u + at

v = u

so it will continue to move at constant velocity

option c) is the correct answer

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