Abaseball outfielder throws a baseball of mass 0.15 kg at a speed of 40 m/s and initial angle of 30 degrees. what is the kinetic energy of the baseball at the highest point of the trajectory? ignore air friction.
a. zero
b. 30 j
c. 90 j
d. 120

Kinetic energy, E = 90 J

Explanation:

It is given that,

Mass of the baseball, m = 0.15 kg

Speed of projection, v = 40 m/s

Initial angle with horizontal,

At the highest point, the vertical component of velocity is equal to 0. There is only horizontal component of velocity that is given by :

Kinetic energy at the highest point the kinetic energy of the baseball is given by :

E = 89.99 J

or

E = 90 J

So, the kinetic energy of the baseball at the highest point of the trajectory is 90 J. Hence, the correct option is (c).

ill do it for 100, also this isnt 80 its 40

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.