A car driver takes a total of two hours to make a journey of 75 km. She has a coffee
of half an hour and spends a quarter of an hour stationary in a traffic jam. At what
erage speed must she travel during the rest of the time if she wants to complete the
journey in the two hours?

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