Problem 7. A baseball outfielder throws a 0.15 kg baseball at a speed of 40 m/s and at an initial angle of 30°. (a) What is the kinetic energy of

the baseball at the highest point of its trajectory?(b) What is the kinetic energy just before it hits the ground? (c) How much work is done by the gravitational force during its time in the air? You may ignore air resistance.

Fig: 1