Each of four particles moves along an x axis. Their coordinates (in meters) as function of time (in seconds) are given by
Particle `1:x(t) =3.5 -2.7t^(3)`
Particle :2 `x(t)=3.5+2.7 t^(3)`
particle 3: `x(t) =3.5+2.7 t^(2)`
particle 4: `x(t)=3.5-3.4 t -2.7 t^(2)`
Which of these particles have constant acceleration ?

Options

A. All four
B. only 1 and 2
C. only 2 and 3
D. only 3 and 4

Answer

4