The X and Y Positions (In Meters)of a Particle Are

Multiple Choice

The x and y positions (in meters) of a particle are given by: x(t) = 253 t,and y(t) = -12.0 t² + 155 t + 100.The magnitude of the particle's acceleration at t = 12.9 s is

A) 0 m/s².
B) -12.0 m/s².
C) 12.0 m/s².
D) -24.0 m/s².
E) 24.0 m/s².