Question

A particle is executing shm of time period 4 sec then time tken by it to move from the extreme position to half the amplitude is

Answer 1

t=0 y =A thus
y=Acos wt. w=2π/prd =2π/4 =1.571
substitute value. A/2=Acos(1.571*t)
cos(π/2. *t)=0.5.=cos π/3 t=2/3 s