3. The sum of gravitational potential energy and kinetic energy is called mechanical energy. Use Figure 2 to find the mechanical energy of an idealized pendulum at a
variety of times in its cycle. Identify any pattern you notice in the values of
mechanical energy.
Pls helpp

Explanation:

Mechanical energy = Kinetic energy + Potential energy

We shall calculate mechanical energy at different points of time .

Time        Kinetic energy         Potential energy      mechanical energy

   0                     0                                 4                                  4

    2                     2                                  2                                 4

     4                    4                                  0                                  4

      6                   2                                  2                                  4

     8                    0                                   4                                  4

     10                    2                                   2                                 4

and so on

Hence we see that total mechanical energy is constant at the value of 4

at all time .