A 1.5 kg ball rises upward 2.0 m above the ground when it is thrown straight up. Use the ground as your reference point ( ) for gravitational potential energy. The kinetic energy of the ball at ground level is closest to: a. 0.0 J b. 3.0 J c. 9.8 J d. 19.6 J e. 29.4 J

it may be wrong but i think its a

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.