Which is true about the total mechanical energy of a pendulum in the absence of friction?

1. it exhibits constant velocity motion.

2. it exhibits simple harmonic motion.

3. it exhibits circular motion.

4. it exhibits only upward motion.

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a.the kinetic energy increases.b.the kinetic energy decreases.c.the kinetic energy remains the same.d.the kinetic energy is always zero.