Answer:
P’ is the perpendicular of the particle Pat’s velocity vector at time t.
When the particle moves from P to P1, its foot moves from P’ to Q, which is away from the positive axis.
As a result, the sign is a negative one.
Answer:
P’ is the perpendicular of the particle Pat’s velocity vector at time t.
When the particle moves from P to P1, its foot moves from P’ to Q, which is away from the positive axis.
As a result, the sign is a negative one.