A particle moves along a straight line with equation of motion s = t^2 - 2t find the velocity of the particle at t=1

Question

A particle moves along a straight line with equation of motion s = t^2 - 2t find the velocity of the particle at t=1

Answer 1

t^2 -2t = s(t)

take the derivative

s'(t) = v(t) - 2t -2

v(1) = 2(1) -2 = 2-2 = 0

at time t=1, velocity = zero