Question

A baseball is hit high into the upper bleachers of left field. Over its entire flight the work done by gravity and the work done by air resistance, respectively, are:______
a. positive, positive
b. positive, negative
c. negative, postive
d. negavite, negavite
e. unknow since vital information is lacking

Answer 1

Answer:

Explanation:

As the ball rises up, the gravitational force and the resistance force of air acts downwards and the displacement is upwards so the angle between the force and the displacement is 180°, thus, the work done by the gravitational force and the resistance force of air is negative. So, option (d) is correct.