Question

plz help with his question im not really sure..

Which equation can be used to model simple harmonic motion?

A. d=a sin (wt)

B. d= sin (awt)

C. d=a sin (wt)+k

D. d= a cos [w(t+k)]

Answer 1

must be y = a sin (wt)

Answer 2

so A.

Answer 3

I guess A, C, D if d is the displacement, and also B if the amplitude is 1