Problems
Problem 2.1:
What is the kinetic energy of a 2 kg ball that travels a distance of 50 meters
in 5 seconds?
[Solution]
Problem 2.2:
In a sense we all have kinetic energy, even when we are standing still. The
earth, with a radius of 6.37×106 meters, rotates about its axis once a
day. Ignoring the earth's rotation about the sun, what is the kinetic energy of
a 50 kg man standing on the surface of the earth?
[Solution]
Problem 2.3:
A ball is dropped from a height of 10 m. What is its velocity when it hits the
ground?
[Solution]
Problem 2.4:
A ball is thrown vertically with a velocity of 25 m/s. How high does it go? What
is its velocity when it reaches a height of 25 m?
[Solution]
Problem 2.5:
A ball with enough speed can complete a vertical loop. With what speed must the
ball enter the loop to complete a 2 m loop? (Keep in mind that the velocity of
the ball is not constant throughout the loop).
[Solution]
