At what displacement the instantaneous velocity become equal to half of its maximum velocity? Plz help me

Answer 1

Depends on the acceleration. If acceleration is constant

vf=at
so when is v=1/2 vf=a*(t/2)
answer, v is one half final velocity at t/2
but displacement is 1/2 a t^2, so because of the square, when time is 1/2 final time, displacement must be 1/4 the final displacement.