Can the instantaneous power output of an a.c. source ever be negative? Can the average power output be negative?

Can overall energy of a body be negative?

Can potential nergy of an object be negative?

Can the speed of a body be negative?

Average power of an a.c. circuit is:

The instantaneous current from a.c. source is given by I=5 sin 314 t. What is the peak value of current?

The instantaneous current from a.c. source is I = sin 314 t. What is the peak value of current?

The instantaneous current from an a.c. source is i=0.5 sin 314 t. What is the r.m.s value.

The instantaneous current form an a.c. source is I = 5 sin (314t) A. What are the average and r.m.s. values of the current.