Pierre pushes a hockey puck that is initially at rest on frictionless ice by applying a constant force until the puck reaches a final velocity of 1 m/s . On his second attempt, Pierre wants the hockey puck to reach the same final velocity by applying a force that is twice as large. Therefore, Pierre must exert the larger force for a time interval that is

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative