1.in which case is positive done?
a. A eastward force is applied to an eastward soccer ball that is already moving at a constant velocity to increase its speed in that direction.
b.A car is moving at a increase at a constant velocity of 10m/s [W] when a 0.5N[E] force is applied.
c. Earth applies a force on the moon as the moon travels one completion rotation in orbit around earth.
e. The work done by air resistance on a ball as the ball, which was initially at rest, falls 3.0m down towards earth.
2. A 5.00-kg sack of potatoes is raised to a height of 2.00m and then thrown (Horizontally) at a constant velocity of 2.00m/s onto a truck. What is the kinetic energy of the potatoes?
a.5.00J c.10.0J d.103J e.108J